tRANS WAS REBUILT 6000 MILES AGO SAT FOR A YEAR IN CAR RAN FOR 5 MONTHS NO PROBLEM NOW IN DRIVE SHIFTS 2 SECOND GEAR THEN MPH SLOWS AND RPM WINDS UP MANUALLY PUT IN SECOND DOWNSHIFTS AND HOLDS 3000 RPM ROUGHLY 20MPH REVERSE FINE. hOPEING NOT TRANS OUT OF WARRANTY COULD SENSOR CAUSE LIKE TPS OR VSS OR TPS. pLEASE HELP ANY INFO APRECAITED.