As most of you know, the dealership told me I need a new TB; a few of you said it could be coil #4 causing computer interference. Well, those of you that have experianced this isssue, I'm listing the codes and I'd like to hear if they are about the same thing you had, or if they are totally different. P0121 (TP Sensor Circuit Performance Problem) P0122 (TP Sensor Circuit Low Input) P0221 (?) P0222 (Throttle Position Sensor B Circuit Input Low) P0223 (Throttle Position Sensor B Circuit Input High) P2104 (Throttle Actuator Control System - Forced Idle) P2106 (Throttle Actuator Control System - Forced Limited Power) P2110 (Throttle Actuator Control System - Forced Limited (RPM)) P2112 (Throttle Actuator Control System - Stuck Closed) P2135 (Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation) So, do you all think this sounds about right for the coil #4 issue? Also, mine is an 03 V8; is it year-range or engine specific?