It turns out that the throttle is getting hung up on the manual throttle cable barrel nut. I've tried to rotate it and change its orientation but no luck. It's only a little fast, not racing.
I installed the small washer, hoping it would provide a surface for the nut to rub against and allow the throttle to return fully home. It doesn't.
A light tap of the pedal releases it and idle returns to normal.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
