I have a 2004 camry le 115kmi which I gave to my son, has had recurring problem. Car goes into limp mode and won't clear. has code p0121 which says tps/throttle sensor/perf. I checked gas pedal see a circuit go up b circuit go down, check +m,-m from throttle body see a -m circuit voltage go up +m voltage go down, engine revves freely but not in sycn with throttle pedal limp mode, no codes showing, changed throttle body I immediately get code p0121 which clears and comes right back,engine will only rev to 1800rpms and i do not get any voltages on +m,-m leads at ecu anybody have any help I think second throttle body worst than first