TL* THE CONTACT OWNS A 2008 CHEVROLET SILVERADO. THE CONTACT STATED THAT WHILE DRIVING 55 MPH, THE VEHICLE WOULD START TO JERK AND HESITATE TO ACCELERATE. ALSO, THE CONTACT MENTIONED THAT THE VEHICLE EMITTED EXTREME AMOUNT OF SMOKE TROUGH THE EXHAUST EVERY TIME THE VEHICLE WAS STARTED. THE MANUFACTURER OR DEALER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILES WAS 170,000.