RPM SURGE AT IDLE; AUDIBLE EGR SURGE; LOW POWER/SMOKE/ROUGH IDLE FOLLOWING A COLD START THAT CORRECTS AFTER ENGINE IS WARM; SURGE ON RESUME WITH SPEED CONTROL; INTAKE FLUTTER SOUND AT STEADY STATE THROTTLE, JUST BEFORE DOWNSHIFT, ON AUTOMATIC TRANSMISSION VEHICLES; BUCK/JERK SURGE ON MANUAL TRANS VEHICLES. *TT