SPARK PLUGS, SPARK WIRES, FUEL FILTER GASKET, MASS AIR FLOW SENSOR, CATALYTIC CONVERTER, MANIFOLD ABSOLUTE PRESSURE SENSOR, PCV VALVE AND HOSE, CHECKED ALL RELAYS AND FUSES, BOTH UPSTREAM OXYGEN SENSOR AND DOWNSTREAM OXYGEN SENSOR. CAR IS BACKFIRING UPON ACCELERATION AND IS OBVIOUSLY RUNNING RICH TRYIN TO FIND OUT WHY
P0300 Random misfire,the most popular cause of this is the fuel pressure regulator, what happens is the diaghram rips and sends fuel into the intake causing random misfire ,backfiring on accleration ,this is when the fuel pressure becomes too low due to the fuel regulator.If the fuel regulator is found to be faulty check the oil make sure it did not get diluted by fuel.
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