S40 revs up and down at idel
Just a FYI - I have a S40 X reg auto petrol.
I had revs going up and down at idle - I could feel it through the steering wheel.
On investigation I found one of my vacuum hoses had come disconnected from the air filter (- goodness knows how as its well supported/connected) - shoved it back in and hey presto - back to normal running.
Im just saying its worth checking your vac hoses first before starting to dismantle things.
Mine was the one from the rear of the air filter.
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