I RECENTLY REPLACED THE TPS ON MY 1991 RAM 250 (251,000MI). EVERY NOW AND THEN THE OLD ONE WOULD DROP OUT OF FOURTH AT CRUISING SPEEDS. ALSO AT WIDE OPEN THROTTLE IT WOULD SHIFT INTO FOURTH AND STAY IN FOURTH UNTIL THE TRUCK TOPPED OUT (100MPH). SO I PURCHASED A NEW ONE. IS IT NORMAL FOR MY NEW...