When I accelerate hard or drive uphill, the engine sometimes hesitates and loses power but then recovers and seems to run ok, and the CEL comes on. It sometimes flashes then when on the highway at speed. p300 random multiple misfire detected, p302 cyl 2 misfire detected, p303 cyl 3 misfire pending, p135 o2 sensor heater ckt bank 1 sensor 1, are the codes i got. I replaced wires, rotor, cap, plugs, but same problem. I swapped plugs between cyl 2 and 4, but the cyl 2 misfire returns. Could it be the fuel injector in cyl 2. I was told that it must be the cam sensor, also. Recently had the heads replaced, so new gaskets on the top end were done about 1000 miles ago.
thanks for any ideas.
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