Likely bent accelerator wire link. Check the linkage on the up-down for bent or disconnected. Possibly not likely bent hydraulic line.
SOURCE: High engine idle 94 Mercury Cougar
replace throttle body gasket. first check to see if carbon has built up around the throttle valves in throttle body if so remove and clean it with throttle body cleaner.and a old tooth brush. besure to remove all electrical components or any thing that plastic or rubber the cleaner will destroy it.
SOURCE: My 93 dodge w250 5.9
Great engines using Bosch injection. This should be physically inspected for anything that may be missed but it really sounds like you have an internal leak in the pump causing excess fuel to be delivered to the injectors. If this is the case, the pump can be rebuilt but only by someone qualified with these. If you need removal instructions, let me know. Air leaks will not cause this on a diesel engine.
Start at salvage yard
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