before removing the injector and other bits, replace the spark plugs and retest, If the problem persists then swap an ignition coil from another cylinder.

I had a misfire problem and the culprit was worn out OE spark plugs at 160,000 miles.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)