My car has a misfire at Idle or when coming to a stop,Rpm goes up above one and then down to under 500 and the lights go dim like its about to shut off sometimes it doesnt shut off sometimes it keeps going up and down for a while, but most it keeps turning off, it says cylinder 4 misfire i changed all spark plugs and coil for cylinder 4 &1. i used fuel injector cleaner i changed the battery i changed the radiator. It needs knock sensor and 02 sensor.
My car has 119000 miles.
My car has an automatic transmission.
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