GMC Yukon rough idle and backfiring through throttle body with misfire code on GMC Yukon

Some GMC Yukon owners report experiencing rough idle and backfiring through the throttle body, often accompanied by misfire codes. These issues may stem from a dirty or failing throttle body, which can disrupt engine operation and lead to an unstable idle. Additionally, a bad coil pack can cause pronounced misfires at idle, while worn or fouled spark plugs can further contribute to rough idling and misfires. Some owners also note that backfiring during acceleration may indicate problems with the fuel pressure regulator. Misfire codes such as P0206 and P0306 might suggest injector circuit or ignition misfire issues. To mitigate these problems, owners are advised to clean the throttle body, check and replace faulty coil packs, inspect spark plugs, address fuel pressure regulator issues, and investigate the injector circuit and ignition system for malfunctions.