Help! Wiped cam lobes? - Video inside

The rusty spring that is still connected in your pick is not the throttle return spring, it is holding the kickdown (transmission pressure valve) all the way forward. You could either bend another loop in the end (if the loop broke off), go to your best local hardware store and check out their spring selection or have a stroll throughout your local wrecking yard. DO NOT run the car without the transmission kick down linkage, you will fry the transmission.