1996 Fore E-150 Inline 6 Check Engine Light Problem

Hello all i am new to this forum.. I am hoping that you ford experts can help me out here. I have a 1996 E-150 Inline 6. The check engine light is on once again. It is for the fuel buring too rich/lean in bank 1 and 2. The van has new cats, 02 sensors, mass airflow sensor and i had an exhaust leak repaired... Anyone have any other suggestions? I wanna get this light off and make it stay off!!!!!

I would like to thank all for their help in advance.