It's probably the Throttle knob. See if you can get it sprayed with some penetrating oil of some kind. If the cable housing isn't sealed inside plastic sleeve,just soak the whole housing down. If it does have the plastic,try to get some started into thehousing behind the knob and jiggle the knob so the oil can make its way down into the cable housing. Eventually you'll get enough oil to get freed up. (Also disconnect the end that hooks to the carb linkage so you won't have the carb to fight against. Once you can move it,keep oiling and working it open and shut until it's relatively easy to slide. Then you can hook it back up. (the throttle uses a little friction to hold the throttle open a little for using the PTO on the transmission or just for warming it up,so if it works too easily it won't hold the throttle open.)
Or you can just remove it and buy a new one from one of the vendors who support this forum.
Speed

Last edited by speed 6351; 08/17/2008 8:52 AM. Reason: forgot to sign message

1954 GMC 350
1957 GMC 1/2 ton
1962 Chevy C-30
1952 Chevy 6400 dump bed project truck
'98 Harley FLSTC
'66 Pontiac Catalina
'76 Chevy 1 ton Duallie
'84 Bronco II
'78 Dodge W-200
'81 Toyota 4X4 truck