Hi All

I have a 2002 S60 T5 se It is suffering from an erratic tickover. A friend suggested it may be related to the a/c compressor cutting in but I have had the a/c turned off to no effect. The idle wanders between 500 and approx 1000 rpm a couple of times then settles back to normal. Can anyone offer any suggestions as to what could be causing it. I don't think there's any air leaks as same friend checked it.