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So I got a WS6 Vert from 2001, M6, with 19.200mls bone stock. Engine started to stall on the highway and backfires, I scanned the code and got P0302. I checked the plug
it looked ok, also the wire lokks brand new. So I orderd a new Ignition Coil and installed it today, but I still got the P0302 and the engine runs not smooth. So, where to look next? Car has still the first fuel filter- but this will not effect only one cylinder I think? And it runs rough even on cold start, so I think it could not be the 02 Sensors?
So I got a WS6 Vert from 2001, M6, with 19.200mls bone stock. Engine started to stall on the highway and backfires, I scanned the code and got P0302. I checked the plug
it looked ok, also the wire lokks brand new. So I orderd a new Ignition Coil and installed it today, but I still got the P0302 and the engine runs not smooth. So, where to look next? Car has still the first fuel filter- but this will not effect only one cylinder I think? And it runs rough even on cold start, so I think it could not be the 02 Sensors?
Did you check the gap. Looks to me like much more than 40 thousands.
Flip flop the coil with another to check if misfire changes cylinders.
Check the pins on the coil pack connector. One of the pins might be bent.
Same for injector connector.
Check injector connection - might be loose. Can you feel the injector click?
With a digital temp gun - check the exhaust header temp on each cylinder and compare values. If one is cold - on mine it was no fuel.
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Code P0302 - Missfire - need Help! 
