surging

1994 CHRYSLER LHS
24,500 MILES • 6 CYL • FWD • AUTOMATIC
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OLDGUY194712
  • MEMBER
  • 1 POST
What would cause a 3.5 engine to surge will go from 800 rpm up to 1200 rpm when warmed up
Feb 18, 2011 at 10:05 PM
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WRENCHTECH
  • CAR REPAIR CONTRIBUTOR
  • 20,761 POSTS
You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and 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.
Feb 18, 2011 at 11:23 PM
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