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I am being told i have a vacuum leak because my engine idles hard as **** and when i slow down it wants to die on me can you tell me where i can find a vacuum line diagram or where to begin

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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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redux1
after many posts, we see only 1 clue engine
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the 6ve1 engine
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but if pcm goes in to limp home mode.
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are you using good scan tools real that see all factory codes. p1, p2xxx?
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