Hello all, I have a 1995 E420 that has an electrical gremlin I guess. Car started back in the summer after warming up, running very rough like not firing on all cylinders. Will not start back but backfires through throttle body and strong smell of fuel at exhaust. Let sit a couple of hours start ups fine and runs good again for 10 to 15 mins. I know nothing about Closed loop or Open loop but I do know that I have had to professional mechanics work on the car since July and after throwing parts at it I am really dissapointed we have not gotten any further. Replace MAF sensor in spring, top wiring harness summer, plugs(Double plats), Distributer caps and rotors, plug wires(last night), Tried different ignition modules, coils all same results. I am at a point of not knowing what to do next. I have more money in the car than its worth however it is a nice looking and clean car for 214xxx miles. Any suggestions? Checked 4 fuses on Computer module on passenger side all were good.