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Re: 1998 Jeep grand cher. 4.0l P0121 and bucks at 5300 rpm
Posted to Technical Discussion Forum on 10/27/2006 4 Replies

I would have to ask the question,, why are you trying to run this engine at 5300 rpm? I would imagine that it had a rev limiter that was kicking in. Login to read more.

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