have a 1991 300 E 2.6 after idleing for about 10 minutes the ca starts coughing and spitting and stalls out.Cannot restart until it cools down. I have replaced the coil,OVP Relay,Plugs,Cap and Rotor ,coil , Reference sensor,checked fuel pressure OK,O2 sensor and the car still does it.Seems like it quits getting spark,because when you do try to restart it backfires a bit.Any suggestions as to what this could be?I'm mechanically savy,but this one has me baffeled. Thanks for any help.

Mike

I have replaced the coil,OVP Relay,Plugs,Cap and Rotor ,coil , Reference sensor,checked fuel pressure OK,O2 sensor and the car still does it.Seems like it quits getting spark,because when you do try to restart it backfires a bit.

well darn it mike, you went through my whole list. are you putting out correct voltage?

replace the big fat silver realy near the battery. the one with fuses in the top.