Originally Posted by cowman79
Since it appears that I have a fuel air problem I guess I will check a little closer for vacuum leaks. The previous owner installed an aftermarket BBK throttle body and a BBK CAI. He didn't install the BBK mass air flow sensor it appears that he reused the factory one. I have already checked the mass air to make sure that it is clean and there was no debris or oil on the wires.
This is a picture of the CAI and throttle body
a mass air fault would cause both banks to run rich/lean. you have a bank specific problem. since you're running rich it could be a leaky injector on bank 1 or maybe something clogged that won't let proper airflow in to a cylinder in bank one. it is very rare, but maybe your upstream o2 could be at fault. or even rarer, it could be your pcm. I worked on an f-150 with your problem. I took the injectors out and turned the key on (engine off) and injector #2 would slowly start to form a little drop of fuel (leaking), BUT as soon as I would electronically disconnect the injector the leaking would stop. so it was a pcm problem. if it would have continued to leak disconnected, then it would have been a bad injector.