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1997 Chevrolet Blazer engine surge

Tiny
W_SLAVEN99
  • MEMBER
  • 1997 CHEVROLET BLAZER
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 177,691 MILES
Engine will rev up and down while driving. We have checked the egr valve, the tps, replaced the fuel filter, replaced the fuel pump, replaced the spider injector system, and checked the exhaust for clogs. I have tried all I know and im at a loss
Monday, July 7th, 2014 AT 12:09 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
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.
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Monday, July 7th, 2014 AT 2:29 AM

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