I have an 87 iroc with a 305tpi in it. My problem is that when I'm driving on the freeway and I try to go and pass somebody the car starts bucking really bad and I either have to floor it or drop it in to drive inorder to get it to go without bucking. Now the strange thing is that it does this at almost any speed and it also does it when I'm just driving down the street in drive and try to give it some gas to get up a hill or something. It's really making me mad that I can't drive normally any help at all would be appreciated since I am new to the tpi stuff.

 

describe what it does.. might be able to help u then

 

My car is doing the same thing as yours nellies. Still have not been able to get a defint answer. Some of suggested the Throttle Position Sensor may be bad our out of adjustment...but not sold on that idea yet. Help us out guys.

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91 Firebird 305/TBI - cam:.420/.442 204/214 - Hooker 1 5/8" headers - TFX PaceSetter Cat-Back - 3.42's Auburn Pro Posi - ASCD Ram-Air hood - Polished Formula Wheels w/Futura's - Open element - .5" Corian TB spacer - Lakewood LCA's - Hotchkis Lowering Springs - KYB Struts/Shocks - 14.78 @ 97.5 mph(G-Tech) - MacEwen MotorSports Whiteface Overlays - 412ci sb waiting to go in this spring.
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Take the leather strap off its Nuts ?


Just a little bull riding humor....

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85 Z28 - Daily Driver
60 Ranchero - Project ( Money Hole )

 

Could it be something as simple as the timing being off spec? Could the distributor cap/rotor have excessive carbon tracking on the inside terminals?


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
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Does it do it when your accelerating slowly form like a stop light? Cruising down the highway and you accelerate slowly? Stomp it and nothing happens for awhile? A little hard of starting?

......fuel pump.....

just put a new one in mine

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1986 Trans Am
305 TPI
"If it's not one thing, it's another!"
http://www2.hanover.edu/hierlmeier

 

I'd have to agree with 86 Trans Am. After replacing my FP my car hasnt hesitated on stomping on the gas yet.

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Shouldn't bother putting this but hey what the heck:
1988 Maui Blue Firebird 305 TBI stock (WITH NEW PAINT!! YAY! )

 

If it is bucking, you also may want to have your transmission checked out. If power isn't being transferred to your wheels, it may be going into bucking the car around. Mine did it just a little, a few months befor the transmission died.
Corry

 

Sounds like you have the problem mostly with the engine under load, and that usually indicates ignition problems. What shape is the plugs, wires, and cap& rotor in? Primarily the wires. Not having a wire fully seated is enough to build up carbon & carbon tracking, and will wreak havoc on the drivability of an engine. Check the easy stuff before condeming the fuel pump and transmissions.

Even if you just did a "tune up" or whatever, make sure all the wires are fully seated, etc...

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'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Ported Plenum,
TB Coolant Bypass,
SSM SFC,
Boxed LCAs,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
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'97 Bonneville SSE