I've been having an issue getting the engine to run/idle smoothly with the MAF sensor plugged in. Seems to run great with it unplugged but as soon as it is plugged in, it runs like crap. I did also try a new MAF sensor, with no luck. The only thing I can think of is that the PCV line doesn't have a perfect seal. I connected the line up directly without the check valve but still no luck...
kinda gave up for the night just to give it some thought. It is definitely electronic or vacuum related because when it is unplugged it starts and runs perfectly....at a loss for today. any suggestions?