300CE Idle Problem

[fsultan]

I have a 1989 300CE with Idle problem. The engine stalls when idling or slowing down to a stop. The problem comes & goes. When I remove the 10-amp fuse on the Overvoltage Protection Relay (OVP), the car runs perfectly, but I loose the ABS and Cold start. The ABS light comes on and the Car does not start when cold.

Any Help will be appreciated....