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hello all, i have a problem with my 2003 grand , when at highway speed it shutters and jumps or bucks, i looked at the i.p. when this is happening and the speedo needle bounces all around . no other needles move . this problem started yesterday and it is intermittent, i can...

check engine light came on ,so i put a code reader on it and it was p0505 . engine idle malfunction,,, any ideas where to start .. runs good idles a little low 600ish rpm.. 2003 grand cherokee, 4.0 91000 miles .. any help is appreciated ...

hello all, first time poster here. picked up a 03 grand cherokee about a month ago and knew i would have to put some cash into it , but its starting to get a little crazy now . what i have is a knock or thud in the rear suspension area when i go over small bumps and regular street cracks and...