stumped big time>>>>>
son has a e32 735i 1991 engine starts but sputters and revs up and down between 1000 and 2000 rpm all by itself. Throws a code 1222 lambda control 1. The code of death. I have looked for vacuum leaks by smoking the intake. no leaks. I have clean and tested the throttle body and afm all is good. It acts like the air control valve is clogged but this throttle body has the eml feature. Fuel pressure is good. Thermostat tested good. O2 sensor replaced.

anyone out there have a clue?