Originally Posted by dw456post

Was it running ok before the valve cover swap? If this is the first startup and drive around, it may be that moving the location of the MAF and size of the tube requires a retune. It looks like that is a hand held programmer or scanner? The STFT's are not that bad, but you need to reset fuel trims to reset the LTFT's. Long term fuel trims are an accumulated number that the computer averages over time. Short term trims are what's happening right now. I have my LTFT's turned off in my tune. A wideband would help tell you what is going on with the fuel/air. What computer are you running? Are the rear O2's turned off and is Cat over temp disabled if you have no rear cats? That can throw off trims also.