Greetings. I am having a rough idle condition with my 92 500E. I have replaced the upper wiring harness, spark plugs, cleaned and inspected the rotors and caps (ok). The plug wires are new as well. The car will also occasionally idle very low and stall.

I have the ABS and ASR light on intermittantly. I think I am narrowing it down to the EZL module. I am curious if I can diagnose this device myself. There is a 3-pin connector on it, which I can pull with the car running and have no effects good or bad. Normal?

Thoughts/Suggestions/Comments are appreciated! Thanks!