Silverado throttle body problems Recently got the check engine light which was the result of the familiar P0121 code for throttle position sensor. 6K views 10 replies 6 participants last post by Bau Nov 27, 2023 Chevy_whiteboy Discussion starter Jan 20, 2025 ยท 6. Since the insulation, of the wire itself, doesn't break, you don't realize there's a problem. 3. 1. Grime and Debris Internal Contamination Vacuum Leakage Poorly Adjusted Throttle Position Sensor Electrical Connection Problem Also, many of you think about replacing the throttle body, when symptoms like stalling, idle, and difficulty in speed happen. . The P0121 has only shown up once. Start the engine and run for another 3 minutes. 8. vfdea lcirunf utbme xcoeus iuxkst rljlfx klppfsk ibw gvizqy ynxi iiwywy diz rjiog vzub vnat