Hey scotty, i have an 03 neon that hesitates during acceleration. If you put it in park and give it gas up to 4k rpm you can see the tach jumping. Checked main 3 ignition components, tps sensor, replaced cam and map sensors... no luck. The car is also loud, but only in the cabin. Could it be a bad exhaust manifold gasket? The engine has 72k miles on it. Thanks

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could be, if it's leaking, fix that first, it will effect air fuel ratio