Join Date: Feb 2011
Location: Newport News, VA
I have the same thing happening to mine (2006 Cobalt LS). Except mine starts at 45ish on up and it also starts to shudder harder when I begin to brake. I just had the wheels balanced and rotated too btw. I'm starting to think it's a wheel bearing gone bad. They did say I have a dented rim but they said it wasn't throwing off the balance. I am changing the rim though just to be safe.
BTW, if anyone has a stock 15" rim for sale, please PM me.
2004 Silver SRT4
2006 Laser Blue Cobalt LS