hesitation/stumbling

Bacondoggy

Registered User
when the car is in low rpms when I give it gas even on a flat road it will cough, buck, and sputter severely, and actually slow down. I have a new IAC, can't find a vac leak, have 3 MAF's. New plug wires and plugs, car has 70k on it. I know I have posted a similar post in the past, the check engine light will go on and off randomly after warmed up. put new heatsink compound to be sure about that. During a dynamic run test it threw 2 codes saying bank #1 and #2 are running lean. changed fuel filter, checked fuel pressure at the lines. I am just baffled... ugh :eek:
 
Running lean? Check the ground cable on the back of the drivers head, that is for the O2's, maybe a leaky intake manifold gasket? I got lean codes when I forgot to connect that back ground cable. Good Luck
 
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