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Miss at rpm

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Old Mar 25, 2004 | 01:38 PM
  #1  
brent4a's Avatar
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From: So MD
Car: 90 Formula
Engine: 305 tpi
Transmission: T-5
Miss at rpm

I have a miss at 2200 rpms or so. It does it no where else in the rpm band. All "tune-up" parts a fairly new...any ideas ??
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Old Mar 29, 2004 | 09:24 AM
  #2  
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From: So MD
Car: 90 Formula
Engine: 305 tpi
Transmission: T-5
Anyone have anything for me to check ??
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Old Mar 29, 2004 | 09:27 AM
  #3  
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From: So MD
Car: 90 Formula
Engine: 305 tpi
Transmission: T-5
If this needs moved , please move to correct forum...Thanks
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Old Mar 29, 2004 | 11:37 PM
  #4  
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From: Southwest Chicago 'burbs
A "dead spot" in the TPS maybe? Hook a DVOM up to the ground and signal wires and then slowly move the throttle to the open position, while watching the meter and making sure it moves upwards very linear reading.
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Old Apr 2, 2004 | 01:53 PM
  #5  
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From: Miami, Florida
Car: 1990 IROC-Z
Engine: 350 L98
Transmission: 700R4
did you check all your plugs to see if they're fouled?
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Old Apr 2, 2004 | 04:33 PM
  #6  
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Car: 1988 pontiac firebird formula
Engine: 305 tpi
Transmission: m-5
i have the same problem wont do it if i rev it up between 2000-3000 rpm but only when im driving...acts like its running on 5 cylinders.but once it warms up itll stop doing it.ive changed plugs wires cap rotor distributor coil n still hasnt fixed the problem.im at a lost on what else it could be.
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Old Apr 2, 2004 | 08:21 PM
  #7  
MRIROC's Avatar
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From: HAMMOND.IN
Car: 87 IROC
Engine: 355TPI SUPERRAM
Transmission: 700R4
what kind of ignition module do you have.i had the same problem and it turned out to be the module.its under the distributor cap.
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Old Apr 2, 2004 | 08:53 PM
  #8  
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Car: 1988 pontiac firebird formula
Engine: 305 tpi
Transmission: m-5
not sure what type is in there at this moment it came with the distributor when i bought it.....i have an extra one that ill try and see if it solves the problem.thanks for the suggestion.
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Old Apr 2, 2004 | 10:41 PM
  #9  
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Car: 1988 pontiac firebird formula
Engine: 305 tpi
Transmission: m-5
i have found out that it wasnt the module but the plastic vacuum line coming from the firewall to the check valve.it had a small crack in the plastic line.thanks for yalls help.
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Old Apr 6, 2004 | 03:34 AM
  #10  
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From: So MD
Car: 90 Formula
Engine: 305 tpi
Transmission: T-5
I will check that also....Thanks
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Old Apr 6, 2004 | 09:44 AM
  #11  
loc1971's Avatar
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Car: 1988 pontiac firebird formula
Engine: 305 tpi
Transmission: m-5
might wanna check the ground on the back of the motor to the one that gounds from the motor to the body.its on the passenger side on the back side of the block.and sucks to get to.
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