Rough idle

1995 CHEVROLET ASTRO
196,000 MILES • 4.3L • V6 • AWD • AUTOMATIC
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AL BLAND
  • MEMBER
  • 1 POST
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.
Feb 14, 2017 at 4:31 AM
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WRENCHTECH
  • ✓Experienced 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 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.
Feb 14, 2017 at 5:00 AM
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