have someone step on the throttle while you look at the linkage as it moves. odds are good you will see what is wrong if it's linkage related. likely the bolts that hold the swivel parts to the valve cover are loose.
if everything moves smoothly, and it does not look like things are broken, post back.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!