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Truck starts just fine, revs really high, then really low and cuts out, whats the problem?

I have a 2000 Chevy 5.3 liter V8 Silverado, on really cold mornings I go out and start my truck and it will start just fine, then it will rev up to really high rpms, sometimes up to 3,000 for a few seconds, then it will drop down to about 500 rpms, then cuts out and dies. If I hold my foot on the pedal for a little bit it will warm up and runs just fine. And when it's warm outside it doesn't do this at all, what is the problem?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

emissionwiz
  • 75005 Answers

SOURCE: not reving high on cold start

Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Posted on Feb 06, 2009

  • 398 Answers

SOURCE: Cold days 94 f-150 high rpm start

probably is a emissions sensor problem, lots of these parts are plastic. check out the throttle cables, lub em wd40. there is a type of valve somewhere on top of engine, it may be cracked, pcv valve stuck. lots of possibilities, almost too much for solution online. something emmissions with an electronic sensor is acting up.

Posted on Feb 25, 2009

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

  • 1 Answer

SOURCE: 2002 Hyundai Elantra 100k miles - 2.0l - running rough

When I had this same problem...it was the Catalytic Converter...cost about 200 to get it fixed at the Hyundai Dearlership :)

Posted on Apr 01, 2010

  • 92 Answers

SOURCE: I have a 96 chevy k1500 silverado with 5.7 vortec

Intake manifold gaskets, a chronic problem. Parts are cheap but its a days work.

Posted on Dec 30, 2010

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