I have a 1996 F150 with the 4.9L inline 6. It starts and runs fantastic. After it warms up and I shut it off it won't restart. I have installed new plugs, wires, cap, and rotor. Checked the timing. Cleaned the Mass Air Flow Sensor. Replaced the Air Intake Temp Sensor. Pulled the codes and it comes up with "bank 1 running lean" and "bank 2 running lean". Was wondering what i should check next. The problem is becoming extremely frustrating.