2011 GMC Terrain jerking

2011 GMC TERRAIN
111,000 MILES • 4 CYL • FWD • AUTOMATIC
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PETSKING
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  • 1 POST
my terrain jerks when I am at a stop light. This happens after I have driven a few miles like after it warms up. I always have to shift it into N while at a stop light so it wont jerk forward.
Dec 18, 2014 at 1:12 PM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
So, what you are saying is that the idle speed is jumping around.



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.

Dec 18, 2014 at 3:15 PM
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