Mine only does it with the AC on and when I let off the gas to slow down and stop. My wife's has an automatic and does not do it. Her's also has a DDM supercharger and did not do it before or after the supercharger. Mine is an 07 and my wife's is an 08. After three years and 37,000 mile, I guess I learned to live with it. I wonder if I put a DDM supercharger on my 07 it would quit the shutter when I slow to stop. What do you think Randy?