My 1994 E220 Estate, nearly run in with 200000 on the clock has decided to play up.Sometimes when starting up she fires and runs perfectly on all four pots. Sometimes she fires then runs lumpy as though she was on three pots until you rev slightly then she runs smoothly.If you dont rev slightly she struuggles for about 30 secs thn stops.Depite the mileage the engine is in good order--1 pint of oil in between 6000 mile services--oil pressure up to 3 whilst cranking over.Just had full service made no difference at all. Anybody got any ideas please.---PS new plugs on service--- no fault showing on diagnostic equipment.
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