Simply have someone depress the pedal while you watch the linkage from the firewall to the inj. pump. The pivot could have come apart at the firewall or the straight rod going from it to the pivot linkage just above the inj. pump could have loosened up. With the engine off, rotate the linkage at the pump by hand to understand where wide open throttle stops are located and then watch as someone depresses the pedal inside the car. It should be apparent whats going on and what needs adjusted/replaced. The spring goes straight up from behind the engine and is there for stiffer or lighter throttle pedal feel based on which hole you choose to use.

__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.