P0304 misfire elimination - Alfa Romeo Forum
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P0304 misfire elimination

The 147 ts has been randomly misfiring on cylinder 4 (according to fault code) swapped coils on 3+4, still threw up fault on 4, changed all the plugs, runs better but still occasionally misfires and throws up P0304.
Next step is getting injector ultrasonic cleaned, its it worth getting all 4 done? any one had them cleaned?
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elimination , misfire , p0304

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