I have recently purchased a real straight loyale 4wd wagon, it runs well but--- it is running rough at aprox 3000 rpm in 4th and 5th ( and the check engine lite comes on). I consider myself a fair home garage mechanic on older stuff without all this computer crap but this stuff is killing me.(I live in Calif.) Anyhow here is what I have done so far; r & r'd the fuel filter, removed and cleaned and reinstalled the fuel pressure regulator, r & r'ed the plugs and wires and took special attention to keep wires separated so no cross fire, removed and cleaned the airflow meter and reinstalled after cleaning the air intake boot, did the same to the air control valve and checked electrical operation, r & r'ed the pcv valve, and after all this it still runs like crap. This thing runs great at high rpm in low gears, so I would guess the motor and valve are fine. SO,-- THERE'S GOT TO BE SOMETHING I'M MISSING, ANY SUGGESTIONS??

look @ your disty, check for shaft play. make sure cap/rotor are good. check and recheck and check timing. google it, milesfox has a great video on timing ea82s hth, RV