Thank you all for your comments. Unfortunately, the forum didn't email me that there were replies. Remember, I'm no mechanic, so I'm asking the following follow-up questions strictly for my own education as well as to intelligently talk people I know who do know vehicles better than I. @oragex - I'm...

My wife's 2006 XC90, 5 cylinder, sputters/vibrates when driving at highway speed and the gas pedal is pressed hard for rapid acceleration. I'm not sure how clear that is, so I'll try to explain better. I first noticed it when driving on an Interstate in the hills of West Virginia. We were going abou...