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Please help, my W reg ML320 is badly misfiring! It has been going on for months, I pull away and it goes into limp mode. I turn it off and the problem sometimes clears. On over-taking, it sometimes loses powere and this morning i nearly had an accident. We replaced the oxygen sensor and the...

ML320 Petrol Automatic - I have been experiencing problems with acceleration. When I set off on cold mornings I have to stop several times and switch off the engine. If I don't, the car will not reach more than 30 mph and sometimes even slows down. If I switch off and count to 10 it will...