Q: misfiring
engine is misfiring P0300 only, i changed the dist cap and rotor, plugs and wires, preformed a compression test all cylinders 140psi or better, took fuel pressure test passed the leak down test cleaned the mass air flow sensor, no vacuum leaks found o2 sensors seem to be OK no shorted wires. i need some ideas the engine is still misfiring at idle and under load..... any idea's
My car has 163000 miles.
My car has an automatic transmission.
i use this vehicle to plow snow
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