Question about 1991 Chevrolet K1500

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My 1991 chevy 1500 seems to be missing going down the highway.Also idles rough.Just did tune up.Any suggestions will be greatly appreciated.

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  • coastalhydra Feb 12, 2010

    yes i think my tcc is not working will this cause that type of problem?I think it might be in my trnsmission,but i dont know why it would effect my idle.

  • Richard Scordino May 11, 2010

    how did it run before you tuned it up...same problem?


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Poorly running engine can affect the transmission shifting but the trans won't affect the way the engine runs especially if it is in neutral.
A locked converter would give you different symptoms than what you've said. Have a code check done (most large parts stores do that free) and do some individual tests as outlined in either haynes or chiltons manuals. (you will need a digital multi-meter). I'd pay attention to the throttle position sensor, map sensor and mass air flow sensor (which can be cleaned internally with carb cleaner and a Q tip. also check for vacuum leaks, though unless it is in the hose to the map sensor generally vacuum leaks wont affect running at speed very much unless it's a huge leak.
Checking everything over carefully is the only way to fix problems like yours...i can give you suggestions but even if the vehicle was in my driveway I'd need to do testing to give you the right answer.
Today's systems are great when they work but your symptoms could be anything from an ignition problem to a dirty injector tip.Only good testing will help in a meaningful way.
Good luck If you need help with an individual part, just ask!!

Posted on Feb 12, 2010

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  • Master
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Mite want to spray the base of the throttle body & intake to see if base gasket is shot,,injector cleaner spray,,

Posted on Feb 08, 2010

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