We have a 95 E420 with a random problem,the rpms fluctuate at idle,it will sometimes stall when coming to a stop,(always starts right back up),will buck/lurch under normal acceleration and at cruise speeds.We've had this car to the dealer in OKC 2 times,engine wiring harness replaced,throttle accuator replaced,tune-up etc. the 2nd time they drained all the fuel and replaced all the filters,flushed the fuel system and tank.Picked it up and still had the same problem(they said it was a bad throttle accuator)when I said they had replaced that the last time they said they put a used one in.I said it really doesn't matter they put it in and it didn't fix the problem therefor they should stand behind it and make it good.Didn't happen.Removed the throttle acc. and sent it out to be repaired,came back as no faults found.they said it was probably the e-gas module,sent it out,they called today and said it had 3 componets that were reading bad,told them to repair it ($489 w/shipping),should be back by the end of the week.My question,after the history lesson is this,where do we go from here if this does not correct our problem?Has anyone else had similar problems and if so what did you do to correct them?Sorry about the long post but thought the history would save a lot of questions,thanks.