This Cherokee was stumbling and had a really rough idle. I figured it was a vacuum leak. Before running a smoke test, I just ran my hand over different hose sections and found that when I touched the PCV the air sound changed. It looked originally like that the plastic pipe might have been cracked, but it turned out to be the rubber elbow at the PCV. This part is available from Chrysler for around $20 complete as an elbow alone is not available and supposedly this is an updated part. Seems to be a high failure part according to the parts department.
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2007 Jeep Grand Cherokee PCV crossover replacement
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