[John Baykal]

Hi Eric,

i have a n54 engine BMW 335i. The car is doing a a minor shake like misfire / pulse maybe once in every 30 seconds or 45 seconds when the car is idling warm engine. no misfire codes. I changed the coil packs and plugs. It is a direct injection engine, i see some fouling on some of the spark plugs. in the cold start it is doing a stumble for few seconds which suggest leaky injector. Do you thing the the idling problem above related to leaky injector eventhough the engine is warm? or can it be related to PCV valve system?

thanks
happy thanksgiving
-John

[Author]

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