I recently purchased a 2000 S60T and am happy with the car except while at cruising revs, say 2000 to 2500 rpm, the car will intermittently stutter. By this I mean that the car seems to lose power for fractions of a second. This problem is not always noticable, but can last for minutes at at time over the journey. The stutter can also be noticed when cruising uphill at low speed, between 2000 and 3000 rpm. I have taken it to the mechanic and his diagnostic machine detected nothing. HELP!!!!!

 

does it happen in top gear when cruising at about 50mph?

 

yes, my wife says it feels like the person driving is unsure of the speed, so keep lifting their foot slightly off the accelerator and then putting it down again. It is only just noticeable.