Question about 1988 Chevrolet Camaro

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Misfiring 1988 camaro 350 motor tuned port injection Car starts up and is rough at first but will idle smoothly after warm. When trying to drive it misfires very badly when accelerating.

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  • Joe Morehead Jan 23, 2009

    The distributor/rotor/plugs/plug wires/fuel pump/fuel filter all new.

    Maybe a problem with the injectors?

  • Joe Morehead Jan 23, 2009

    How do you test them? Is there a way to tell if one is bad and not the others. Should a person change them all? I appreciate any advice you can give.

  • Joe Morehead Jan 23, 2009

    is it ok to replace just one? This car was sitting for about 6 years and recently started. The fuel pump went out soon after starting it and I think maybe something got into the injectors. How can you tell if one is clogged? Will it register with a scanning machine/code reader? The service engine light does not come on.

  • Joe Morehead Jan 23, 2009

    Thanks a bunch. Very helpful.

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Its going to be in the timing you might check the distributor cap for hairline cracks and make sure there arent any but at this point it sounds like timing is off or going out

Posted on Jan 22, 2009

  • 1 more comment 
  • Ronnie Houston Jan 23, 2009

    its possible one of the injectors is fouling oout and could cause it to misfire..i hadnt thought about that but yes its possible

  • Ronnie Houston Jan 23, 2009

    usually you will find one leaking gas out the side of it

  • Ronnie Houston Jan 23, 2009

    i9d replace all of them to be on the safe side of things a code reader will tell you if one is clogged but not which one

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There are many things that could cause this problem,a misfiring cylinder ,low compression or idle speed not adjusted right,
Is this car fuel injected or does it have a carburetor?
if the timing is off, or the main problems i have seen are in the carburetor. does this car have an o2 sensor? a bad o2 can cause a bad fuel mixture and make engine load up at low idle speeds.
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Hard starting, rough idle when cold, then smooth running when warm


Need year/make/model/mileage of vehicle to provide a more specific set of troubleshooting steps.

When was the last tune up? Hard starts when cold are usually caused by fouled spark plugs, worn plug wires, or weak ignition coils. Fuel systems are not as effected by temperature changes as the ignition components.

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Hi. I have a 99 camaro 3.8l and I'm having some


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1988 camaro iroc z 350 tune port injected. need to reset timing on the computer. jodie


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Warm up


The high idle is caused by the choke and the high idle on the carb. It is working normal and you do won't to warm up this motor before going. When it is warm and you hit the gas it activates the choke pull off to bring the idle to normal. Your mechanic is used to fuel injection that will control the fuel/air mix according to temp. I still let my injected cars warm up so the oil can thin a little. If you jump on the highway with cold thick oil it can all wind up in the to of the motor.

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