I have a big problem that my main M/B agents do not know what the problem is! , C Class 200, Komp, Petrol 36000 miles from new, car runs like a dream, perfect UNTIL I sit at the lights or a traffic jam, the engine starts to missfire as if running out of fuel, or as if someone is taking the plug leads off, one by one, after 20 seconds idling at tickover, so I switch off the ignition, and restart at once, and the cars perfect all day, no misfiring, UNTIL the next set of Red lights, and so the problem starts again! EMU light goes off and on, day by day! its a right pain having to switch off 20 times a day in traffic! its been like this for months, so I gave in and took the car to my local M/B dealers, they put it on the EMU fault finder machine PC, , and found nothing except pages of the same fault going back months! 2 hours later they said" It needs a new cylinder head, valves and springs, as this multi valve enginge gums up the valve seats, cost £2500, plus vat £3000, oh hang on, , wait a sec, the M/B problem book states that M/B now do whats called an engine burn, where the engine is programmed to get red hot, and burn off the gummed valves, cost £100," so i let them do it, it took 1 hour, result, the car has much more power, BUT THE PROBLEM STILL EXISTS! they have tested the plugs, electrics, fuel injection jets etc, they now want it back to do a compression test! I dont think they know what to do! HELP PLEASE!