I have a 1960 Ford F100 with 292 2 barrel carb. Has a hitch in her giddy up when shifting the 3 speed. Put the choke cable back on and with choke full on she runs pretty good. Soon as I start opening up the choke, back to the old habits and runs rough. Is this a carb problem or something else? What do I need to do to identify this? Bought the old girl to have something to do with my spare time.