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1998 chevy k1500 runs rough till it warms up - 1999 Chevrolet Silverado 1500

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  • Johnny    Brown
    Johnny Brown Feb 13, 2012

    Runs rough at idle, this may be caused by many things,a dirty throtlebody, or mass air flow sensor needs cleaning, even a bad sparkplug wire, i would start with having the computer scanned to see if there are any codes stored or pending, you can go to an autoparts store like an autozone , they will scan it for free and get you the codes if there are any. this is where i would start first.

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SOURCE: 1998 chevy blazer

po 753 Shift solenoid A electrical problem po758Shift solenoid B electrical problem hope this helps

Posted on Apr 09, 2009

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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

  • 491 Answers

SOURCE: 1998 k1500 5.7l 105a alternator. replaced

At idle the alt shows 12.5 ?
How about at 2000 RPM....does the voltage rise with increased engine speed?
If no increase in voltage with higher RPM........the alternator may be defective.
Remember....if battery is low and you add the load of all accessories the voltage may be low at idle speed until the battery is charged up.....this would be normal under this condition. Once the battery is charged the alt can handle the load of the accessories at idle and should be able to keep voltage up.
Also......a defective battery could be taking all the alt has got to give.....resulting in a low voltage reading.
We would like to see approx 14.5 volts when vehicle is running.

Posted on Sep 10, 2009

  • 312 Answers

SOURCE: i have a 1990 chevy k1500, running rough at idle and exhaust stin

replace the coolant temp sensor.

Posted on Jan 22, 2010

  • 12 Answers

SOURCE: Rough idle 1994 chevy pick up k1500 4x4

I had a 96 GMC 1500 with a 5.7 ltr. It would idle rough, especially on start up. After replacing everything under the sun, it turned out the ECM (computer) was shot. I found a used one and plugged it in and it ran fine. I think I paid 50 bucks or so for it. If you know someone with a truck like yours, plug theirs in and see if it fixes it.

Posted on Apr 19, 2010

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