Question about Jeep TJ
In my experience, a vacuum leak has caused the engine to idle up, not down.
You didn't list the year but if yours has an EGR valve that is stuck open, this can definitely cause a rough idle and lower RPMs.
Either Haynes or Chilton will have aftermarket service manuals to cover your Jeep; we have three Jeeps in the family and the manuals can be lifesavers.
They cost under $20 and are available at any chain auto parts store.
Stay safe Marine!
Posted on Jul 21, 2008
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Posted on Jan 02, 2017
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