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BBC Chevy Man · 08-31-2011, 02:45 PM

Did you clean your mass air flow sensor? If not that's were I would start. I've got a 2000 with the 5.3 and it was doing all sorts of weird things until I cleaned the sensor.

08-31-2011, 02:45 PM	#12
BBC Chevy Man Registered User Join Date: Jul 2010 Location: Alberta Canada Posts: 14	Re: 56.3 runs rough when cold & WOT Did you clean your mass air flow sensor? If not that's were I would start. I've got a 2000 with the 5.3 and it was doing all sorts of weird things until I cleaned the sensor.