Hello. Multiple misfires. Started happening while in idol. Runs fine at 2000+ rpms. Replaced plugs. Tested coil packs, power plugs, fuel pressure good at the rail, cleaned maf, will not run at all with it disconnected. Seems to be an air/ fuel combo. Smells rich. When idoling it misfires and the engine shakes, wants to stall. Not sure what else to check. Codes pulled p0300, cylinder 4,5,6. Thanks for any help. 

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Profile picture for user MBFanatic

Change the mass air flow sensor. Cleaning does not work most of the time. 

Let us know if you still have the same problem.

 

Profile picture for user castaaron

Mbfanatic thanks for your response. Is there anyway to test it without replacing? 

Profile picture for user castaaron

Brand new Bosch maf. Unfortunately same result. Any other ideas? I’m at a stand still. 

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