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M535 / 330ci Mpkg
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How does the engine run?? Does it infact misfire??

I would start looking for a vac leak first........Intake boots fail easily, cracks, tears etc.

Then check the crankcase for excessive vacuum by removing the oil cap with it running, listen for idle speed change, and excessive vacuum entering with the cap off.
This would indicate the crankcase vent valve has failed under the intake.

If that all fails, Check Injector Pulse on Cylinder 3!! If you have poor Injector pulse, that would cause the related issue!!

Please let me know if that helps!
 
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