A big fat THANK YOU TO TURBOTROUBLE and his sage advise Have a 05 XC90 2.5T ...had history of p0101 and p2188, which were solved with new MAF Fast forward year later, P2188 coming back. Doubting another MAF, did some checking and couldn't locate the problem. Stumbled on this thread and took his advi...

Thanks for the replies... Wouldnt a vacuum leak cause a rough idle all the time? This will momentarily stumble for like a split second then clear out. Doesnt do it all the time Wouldnt a dirty Throttle unit also cause a rough idle more consistently? Sorry for the questions,just trying to understand ...

Hi I have a 2005 XC 90 Volvo AWD 2.5 L engine My problem is the Check Engine light is on with these codes, P0101 and P2188. The vehicle starts and drives fine. When it sits idling,it will idle fine and then it will momentarily stumble/run rough like its going to stall then clears itself out. No rhym...