1998 Honda Civic idle bumps

1998 HONDA CIVIC
1.6L • 4 CYL • FWD • AUTOMATIC
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NMG
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  • 1 POST
when i start the engine idles normal but when shift into drive the idle jumps up and down almost to stall even while driving and coming to a stop when fully sopped the idle jumps up and down.
Aug 2, 2014 at 5:01 AM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
First eliminate all vacuum or air leaks in the system. 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.
Aug 2, 2014 at 6:37 AM
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