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What others have said: make sure it's the accelerator linkage and not something wrong with the engine or injection system. As the gas pedal is pushed down, the end of the wonky linkage connects to a pivoting bracket down between the engine block and the injector pump. If you examine the area you'll see the idle stop (a vertical screw with a jam nut) and the limit screw (oriented horizontally not too far from the idle stop) with corresponding tabs of the throttle bracket that make contact at idle or wide-open throttle. If the gas pedal is to the floor and there's quite a bit of travel left before that bracket hits the full-throttle stop, your throttle linkage has an issue and band-aiding it is as much your guess as mine.
Better yet, have a picture. You're looking at the injector pump from, basically, inside the engine - that black apparatus is what I'm calling the throttle bracket and the arrows point to the idle stop (right, lower) and WOT stop (left, upper).
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'82 300CD
"Pearl", the very first turbo diesel 123 coupe
Totaled 11/23/18, rebuild in progress.
'85 300TD, "Artemis".
'78 300D euro, "Ol' Red", mostly retired.
'85 300D, "Gandalf".
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