1999 Grand Am Stumbling Throttle
05-14-2013, 01:19 PM
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Year: 1990
Model: Cherokee (XJ)
Engine: Renix 4.0
1999 Grand Am Stumbling Throttle
So I'm fixing a grand am that has a really bad stumble. If you lightly accelerate, it's fine. If you accelerate just a little harder though the thing starts misfiring like crazy like there's no fuel getting to half the cylinders. I am going to test the rail pressure today, I read on another forum that it should be 41-47psi at idle. To me it sounds like a clogged fuel filter because it does it in neutral revs too. Any other ideas?
05-31-2013, 12:26 AM
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