Funny idle on 92 400E
While sitting in traffic the other night:
When heater/ac was on and I came to a stop (with my foot on the brake pedal) the RPM bounces in the 500RPM range. On the low end of the bounce (maybe the 200-300 range), the lights dim and the car almost seems like it's going to die. The rpm bounce is like a 1 second interval.
With the heater/AC off there is no problem.
Anyone know where I should start looking?
Thanks in advance....PEter