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Car won't run right. Suggestions?

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Old 07-06-2011, 09:35 AM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Car won't run right. Suggestions?
When I accelerate slowly my car feels like it is missing. It shakes as it accelerates, and runs like crap. If I step on it I do not notice it. It idles fine. I have recently replaced the spark plugs, wires, distributor cap, fuel pump and fuel injectors. Any idea what could be causing this? I am stumped.
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Old 07-06-2011, 12:20 PM
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Re: Car won't run right. Suggestions?
Have you checked your MAF sensor(you may not have this) or MAP sensor for proper operation. This info to ECM may be off.
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Old 07-06-2011, 12:30 PM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Re: Car won't run right. Suggestions?
I was thinking it could be the Throttle position sensor. I may start there. It is a 91 so it is speed density.
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Old 07-06-2011, 10:55 PM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Re: Car won't run right. Suggestions?
Checked TPS and Map sensor. Not either of those. I actually replaced them both just in case.
Last edited by rdhanded2; 07-07-2011 at 09:36 AM.
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Old 07-07-2011, 09:36 AM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Re: Car won't run right. Suggestions?
Ok, so it is still rough while accelerating, and when I come to a stop it wants to die. I am out of ideas. Anyone have suggestions?
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Old 07-07-2011, 09:56 AM
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Car: 1992 RS
Engine: 305 (LO3)
Transmission: 700R4
Axle/Gears: 2.73?
Re: Car won't run right. Suggestions?
Vacuum leak
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Old 07-07-2011, 09:59 AM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Re: Car won't run right. Suggestions?
I am dumb, where all would I check?
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Old 07-07-2011, 10:06 AM
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Car: 1992 RS
Engine: 305 (LO3)
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Re: Car won't run right. Suggestions?
All vacuum hoses that attach to the manifolld, plenum, map sensor, power brake booster, charcoal canister.....
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Old 07-07-2011, 10:28 AM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Re: Car won't run right. Suggestions?
I will check them tonight and go from there. Thanks
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Old 07-07-2011, 01:55 PM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Re: Car won't run right. Suggestions?
Replaced the fuel filter since I had one. Still the same
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Old 07-07-2011, 08:05 PM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Re: Car won't run right. Suggestions?
Well, I can not see or hear any vacuum leaks. I did find 2 wires that are not plugged into anything. Not sure where they go or what they are. The first is up by the break booster.
Attached Thumbnails Car won't run right. Suggestions?-imag0292.jpg   Car won't run right. Suggestions?-imag0293.jpg  
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Old 07-07-2011, 08:06 PM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Re: Car won't run right. Suggestions?
The second is under the front of the car hanging by the driver side.
Attached Thumbnails Car won't run right. Suggestions?-imag0290.jpg   Car won't run right. Suggestions?-imag0291.jpg  
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Old 07-11-2011, 01:33 PM
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Car: 1991 Z28 Camaro Convertible
Engine: 1988 305 TPI
Transmission: 700R4
Re: Car won't run right. Suggestions?
Originally Posted by rdhanded2
Well, I can not see or hear any vacuum leaks. I did find 2 wires that are not plugged into anything. Not sure where they go or what they are. The first is up by the break booster.
I saw that same cable unplugged in my 91, i've always wondered what it is or where it plugs into
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Old 07-11-2011, 02:32 PM
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Car: 92 Camaro RS
Engine: LO3
Transmission: T5
Axle/Gears: stock
Re: Car won't run right. Suggestions?
Second one looks like the wire for the temp sender for the temp gauge. Does yours work or is it stock? Since you don't seem to have a stock engine, anything you can tell us about the engine in there now would make it easier to help
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Old 07-11-2011, 04:24 PM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Re: Car won't run right. Suggestions?
Stock 305 in a GTA, not the one in my sig. Sorry. Was the ignition module that was bad.
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Old 07-11-2011, 05:01 PM
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Car: 92 Camaro RS
Engine: LO3
Transmission: T5
Axle/Gears: stock
Re: Car won't run right. Suggestions?
Cool, If it runs right now you're probably a happy guy!
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Old 07-11-2011, 07:05 PM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Re: Car won't run right. Suggestions?
So far so good... this week..... lol
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