I have 2 2008 focus se, one I have had both drive axels replaced and the carrier bearing. I also have a vibration at stop lights so bad it shakes my gps. I have 62000 on mine which is the one with all the issues, My wife’s is fine. I found a tsb that covered the vibration but the dealer checked it out and said mine didn't have the problem, I guess teeth chattering vibration is normal. Thinking of changing spark plugs. any suggestions?