With the car sitting in neutral without touching anything what are the rpm like? Sitting in neutral, does pushing the pedal change the rpm? Does moving the throttle linkage change the rpm?

By the way, normally if the accelerator pump goes bad it will leak fuel slowly down the throat of the carb, causing it to bog down near idle and run rich.

I'm sort of new to toyota's, but I think that if it was the spray pump, the only time you would notice it would be when you hit the gas and it fell on it's face. It may be that even though your throttle return linkage is moving back and fourth, the butterflys in the bottom of the carb are staying open. Like I said, I'm new to all things 'yota, but on some quadrajet and holleys, the little shaft that the butterflys bolt to will become worn and make a flat place that can make them hang. Since it isn't flooding, then the problem shouldn't be with the floats. If you haven't already, with the engine turned off, take a light and look down through the top of the carb and see if the base plate butterflys are open.

Sorry it took me so long to get back regarding this problem. Originaly I said that the linkages looked fine on the carb. They are operating as they should be, however after pulling off the carb and looking at it closely, I realized that the throttle linkage was not returning all the way. As I mentioned in my previous post, I converted the carb to manual choke about a year ago. When I did that I just diconnected the linkage for it and left it on the carb. Well, it took a year, but a piece of the choke linkage spun around and lodged itself in the perfect position at the base of the throttle screw. I could not see the problem until I pulled it off of the truck. I pulled off the old unneeded linkage and it runs perfectly now.

Thanks for all of the replies that were listed. I appreciate it.