. Check the Mass Air Flow Sensor voltages. Verify good battery voltage to the Mass Air Flow Sensor on the White/Black wire. Verify good grounds for the Mass Air Flow Sensor on the two Black wires - look for 0.05 volts or less to be ok. Check the output voltage from the Mass Air Flow Sensor on the White wire - specification is less than 0.5 volts key on engine off and 1.0 - 1.3 volts at warm idle. The Green/Orange wire at the Mass Air Flow Sensor is not used. The Mass Air Flow Sensor can test good and still be defective.
2. Make sure the timing belt is not off a tooth. Can check ignition timing to see if one bank is on. May need to get into compression on each bank but a timing belt off a tooth or two will idle poorly but can run better at higher RPM.
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