Does anyone else have this problem? When I accelerate the instant power is applied I hear a klunk coming from the passenger front wheel. When I decellerate, at the moment the engine brakes the car I hear a klunk from the same place. Almost like there is a loose axle or worn spline. Also that wheel gets about 2 x more brake dust than all the other wheels. Anyone else experience this?

I have an 05 MCS, sport package with 9K miles (about 600 miles away from the first service). It started to do this about 1500 miles ago.

 

Check your passenger side motor mount.