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Rough idle

Tiny
AL BLAND
  • MEMBER
  • 1995 CHEVROLET ASTRO
  • 4.3L
  • V6
  • AWD
  • AUTOMATIC
  • 196,000 MILES
My van will rev up and down. It stalled on me a couple times. It does not like to start either. Use to just tap the key and it fired, now you have to crank it for awhile.
Tuesday, February 14th, 2017 AT 12:31 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 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 carburetor 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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Tuesday, February 14th, 2017 AT 1:00 PM

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