I have an 85 F250 with the 460 that I am trying to get rid of. It's been sitting for a good while, maybe as long as 2 years. I went to start it today to check things out before a potential buyer looks at it tomorrow and found that when I pressed the gas pedal to give some gas to start, the pedal stayed depressed and did not return. The throttle cable is attached, but has a lot of slack and it not returning the pedal. I tried to find the other end of the cable in the engine bay, expecting it to have become disconnected for something, but I was unable to tell what was what around the carb.

Can anyone tell me what might be causing the issue and where exactly to look? This will be my first time wrenching on this truck so I am not at all familiar with it. Thanks!