A lot of supercharged motors will idle up and down due to the cam they are running in it plus the addition of the blower throwing more air into it. Did it do this when he bought it? And is the motor stock as far as being a 5.0 or has that been modified as well? Does this have a pop off valve on it? And it may be a lifter making noise.
Monday, May 2nd, 2016 AT 3:28 PM