Hello everyone new to the forum, and got a question. I got a check engine light and had it ran yesterday. It came back running lean on the left bank but no part code. I have a 95 , Ford mustang 3.8L , with a couple bolt ons and I was just wondering if anyone else had this happen? I have changed the rear o2 sensors, the plugs and wires are less than 2 months old, I have a brand new CAI and was wondering if it could be the MAF sensor.

I would appreciate any advise and have 2 good part cars at my disposal that run w/o engine codes.