It's during acceleration once we get to 3k rpm and above. And now my wife claims her MPG has decreased noticibly. I'm ready to take it in unless someone has a brilliant idea...?

We don't so much feel the vibration but we definitely hear it at 3000 RPM. It's certainly coming from the engine compartment and can't currently afford to shell out the $xx per hour for a tech to work on it. We were hoping to find a common thread with other owners. Perhaps not tho. thanks!

We've had our vibe since June 2005 (love it to death) but we do have a vibration around 3,000 RPM. Could tis be a crooked mount? And if so can the techs at Pontiac do this under warranty? I'm no one to start loosening things on my engine, it would probably fall out. -Fusion Orange, Monotone, PWR PKG...