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Originally Posted by makethiscardriveable
Reviving some old stuff here but I have almost the same rough idle issues. Vacuum lines done, Index 12 injectors, hpfp replaced, spark plugs and coils done. Not sure what else to do
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I was in the same boat except the hpfp. I had a rough idle with random misses. Replaced valve cover housing as the gasket was rolled. Replaced coils and plugs. Installed new to me injectors with lower miles and no previous issues. Still had rough idle. Stutters idle. You could tell it was missing in idle but it was hard to mark it happen under load. Sixth gear. Floored to the resistance point. Still no miss. So finally me and my buddy started switching stuff from his car to mine. He has a n54 with no missing. Threw his Ngk step colder from a n20 in and the problem went away. Idle is smooth and no misses. BMW part # 12-12-0-039-6641002D $105 for 6. You should try it.