I haven't spent a lot of time missing with the throttle system on mine, but this sounds more like a throttle/shift cable issue more than just the throttle handle itself. It sounds like the shift cable is binding inside, probably due to dirt or corrosion.
One thing you should be able to do is to disconnect the throttle and shift cables (each one) at the motor and gear box. Then move the throttle lever on the motor (not the cables itself) and see if it is stiff, then the same on the shift linkage on the gear box. If both of those (at the point of termination of the independent cables) move easily, then try to shift the throttle handle back and forth (again, without the termination cable ends disconnected at the motor and gear box) and see if either one of the cables is still stiff. Most likely I bet your shift cable will be hard to move at this point.
Basically, you're starting the process of elimination on the cables from the farthest point back and moving forward up to the throttle handle at the helm.
Let us know how it turns out.
_________________ 1999 180 Horizon OB Fisherman Pkg 2013 Grand Cherokee 4x4 w/ 5.7 Hemi San Antonio, TX
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