My rough idle on my 2008 Volvo was caused by a poor electrical connection for the positive at the battery post. The connecting wire was hung up making a poor seat for the battery post. This was hardly noticeable but dropped the sensor voltage at idle, which caused this and would get worse. Eventuall...

I had a sometimes rough idle at start on my 2008 Volvo S60, I changed my 3 year old battery even though it cranked good with all aspects of a good battery. There was no further problem for at least a month, then the same things reappeared. Thinking of a poor electrical connection I took all cables o...