Hi Don; Sounds like you're on the right track. I don't know if the 68 had a return spring on the pedal. If there should be one, and it is missing, that could explain everything. It is also possible to add a spring to pull the pedal up, if only for a test. I added a spring on my 67 Crown. A universal throttle return spring works fine. It hangs from the steering column & attaches to the pedal. It is up out of sight. Larry 67 Crown 4 DRHT