1993 GMC C1500 idle air control

1993 GMC C1500
78,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
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MARCUS1221
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  • 1 POST
changed out the idle air control and tps still having idle problems especially in the morning when starting up have to step on the accelerator never had to do that.
Nov 18, 2014 at 7:01 PM
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JOHNNYT73
  • CERTIFIED EXPERT
  • 924 POSTS
Have you tried cleaning out the throttle body on both sides of the throttle plate? I would take a fuel pressure reading to be sure the spider junction isn't leaking at one of the valves.
Nov 19, 2014 at 6:29 AM