No acceleration

[ChevyHighPerformance]

It sounds like the engine went into Reduced Engine Power mode. Since the H3 is a drive by wire, it monitors the commanded throttle position (accelerator pedal) using two sensors and the actual throttle position (throttle body). If the commanded postion is different from the actual position -> Reduced Engine Power mode. The vehicle will just limp along in this mode. When you restarted the engine, the PCM found agreement between commanded throttle position and actual throttle postion and operated normally. You can either have the code cleared or it may clear on its own after XX number of driving cycles.