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Re: misfire...wont rev past 4k
The refusal of the engine to rev past 4000 rpms is occuring in park, not while driving.
The stumbling under load at low rpm is an almost textbook example of an ignition problem, typically bad wires.
I hope Im not coming off as a jerk, just stating the facts, the cat would be a good thing to check as well, but would not typically cause the problems the original poster mentioned.
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2000 Oldsmobile Intrigue 3.5 DOHC V6
Mods: Fenderwell Intake, High-Flow cat, U-bend delete, 12-inch front rotors, GMPP handling kit, 20% tint, Pioneer front and rear speakers, Eclipse HU, cleared corners
1986 Jeep Cherokee 2.8 V6
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