i have a 2003 duramax with the 5 speed auto trans i am experiencing a vibration while the vehicle is in gear but the motor is at idle while at stop lights. the vibration feels like its comming through the dash and the brake pedal and steering wheel . It seems to go away when i hit the throddle but returns when it idles down. Has any one else experienced this problem?

 

U might check the harmonic dampner. I have heard ppl have simiar problems with the dampner