Question about 1991 Chevrolet Silverado 2500

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I have a 1990 silverado 5.7 that runs fine until it warms up then it runs rough in gear hard to start when its warmed up

After it warms up it runs rough and when I put it in gear it wants to die and is hard to start

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  • 110 Answers

Im thinking egr valve

Posted on Feb 14, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: 1995 Chevy silverado with a

I have experienced this problem on similar vehicles. You should try and replace the coolant temp sensor. If it is not reading the correct temp to the ecm, it will not get the right fuel map. Also, the cts will not always throw a code.

Posted on Aug 04, 2008

GregV24CHOPP
  • 11 Answers

SOURCE: when cold, it idles rough, revs high then low! After warmed up it runs fine

if it runs high when you first start it then mellows out,, theirs no problem , all of our chevys do that.... but if its sputtering or you hear a quiet popping noise check spark plugs

Posted on May 20, 2009

  • 1509 Answers

SOURCE: rough idle then stalls

Vacume leak or bad idle motor. With the car in park and running with the hood open listen for leaks moving your hand around the different hoses looking for a change in the sounds that you hear. The idel motor also makes the car idel up to 1500 RPM or so right at start-up then idel down, If it doesn;t the idel motor is likly. Check engine light is on when running? Test for codes, Follow code test charts don't skip any steps!.

Posted on Nov 02, 2009

Testimonial: "Found the problem vacume leak like you said."

  • 1 Answer

SOURCE: 93 chevy lumina euro won't stay running

sounds like it could be a fuel injector shorting out. have to get it hot, pull off the plenum and check the resistance in each injector. if any injector has bad resistance, replace it. when an injector shorts out on these particular vehicles, it shorts out the whole injection circuit. and when it cools off the resistance goes back up and it will run ok. i think the correct resistance should be about 13 ohms.

Posted on Mar 19, 2010

  • 95 Answers

SOURCE: 88 CHEVY PICKUP SILVERADO STOPS RUNNING IS JUST WARM

Sounds like a bad ignition coil. Check for spark right after it quits Coils can and do quit working after they get hot. Also check magnetic pick up coil in distributor. After reaching operating temp computer will move the coil and a broke corroded wire loses connection. Then when engine back to cold wire is back in contact and working. Hope this helped.

Posted on Mar 21, 2010

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