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By the way I'm not trying to say it's definitely the intake manifold that's causing your problem. All I'm saying is I believe it's definitely a vacuum leak somewhere. I've had my Jeep since 2003 and in my experience Jeeps are prone to having vacuum leaks.

I've heard the same thing when I was searching around forms trying to find answers for my problem. I knew it couldn't be normal because motors just don't run that way and mine had just started. Really the only answer I got was that it was definitely a vacuum leak but I had no check engine light...

Got an 02 4.0 & I had the same problem. After searching and more searching I found that the half egg shaped washer on the intake bolt at the #6 cylinder had broken. Put a stack of three washers on it, retorqued the bolt end g2g. Hope this helps.

Yes, sooner or later it'll happen . Aside from what the article said we all know Chrysler has walked a fine line of success with the Jeep for a very long time & you can't have ( or even maintain) success without some failure. So, in saying that, they're gonna try it. And, when they do I'm sure...