We did a diagnostic check on my 96 E300D today, and the code came back with a throttle error. The car has a slight hesitation and the check engine light is on. When I bought the car, we checked it and the reader stated "throttle wide open", which wasnt possible since it was sitting idle. Anyway, the part the mechanic pointed to was towards the firewall, on the drivers side with the throttle linkage going to it. Anyone had any experience with this or know what this part is?

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1996 E300 D
1992 300D
1990 Ford E-350 7.3 Diesel AKA "the Deep Fryer"