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Re: 2000 Pontiac GTP Miss Fires
Welcome to AF.
Well, it looks like you have the secondary ignition suspects changed. DTC P0300 can be caused by many things. Basically crank variation caused by a misfire condition is being sensed by the PCM module.
Other possibilities are:
MAF sensor/air induction system
fuel pressure
fuel injectors
EGR valve
CAT convertor
02 sensor if missing is at idle, cruising speeds or transition from closed to open loop mode.
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