Varying engine revs
Hi - i have a 1998 S80 T6. My probelem is that the engine/electrics have developed a fault whereby an intermittent varying of revs is noticed under light load, ie rev counter varies over a 500rpm range. You can feel the engine 'hunting' but no warming light has come up. Anyone have this problem before - is it a new ECU (hope not) or maybe something simple like the mass flow sensor?? All comments gratefully received.
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