2004 Chevy Trailblazer erratic throttle

Tiny
GEORGE7369
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
My truck is having problems when idiling and under load it lobes up and down
Sunday, January 6th, 2008 AT 8:26 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
It sounds like you have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!
If no leak found, check egr system.
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Monday, January 7th, 2008 AT 2:29 AM

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