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Low RPMs at idle. Stalling after idle for a few minutes

Tiny
BGRIFFITH
  • MEMBER
  • 1995 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
When I start my truck is idles fine for about 30 seconds. After that it will drop in rpm drastically to the point it almost stalls the engine. Eventually after it does that a few times it will completely stall out. I've been having problems with it stalling when starting to slow down for a turn, stopping at stop signs and I've had it stall after coming to a complete stop at intersections. So far I've replaced the tps sensor(few weeks ago) and the IAC valve (about a year ago).

this a 350 5.7 liter out of a 95 chevy 1500
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Thursday, September 10th, 2015 AT 10:44 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
First eliminate all vacuum or air leaks in the system (very important)

. You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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Friday, September 11th, 2015 AT 2:20 AM

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