okay i'm driving myself crazy. I redid exhaust work checked for leaks none. I swapped o2's. Checked for vac leaks. Changed Granitelli mafs to stock, and I'm still throwing lean on left bank?!?!
has anyone had this happen i'm driving myself insane checking for plugs to be washed out, and nothing

 

Me too!
I think mine is the o2 sensor tho because it is stripped out.

 

Had this happen once with the tune. Long story short, it was the tuning of the MAF. When you switched back did you re-tune for the new MAF? The Granatelli's are a pain in the butt.