I can't tell you technically what the TPS is all about, but I can tell you that many here have disconnected it and left it that way, including myself. I didn't disconnect it because I was having trouble with my bike but rather because it got rid of the pop-diddy-pop-pop on deceleration.
It must be so friggin' frustrating trying to get your bike running properly again, especially when all you did was park it. You got gremlins living in your garage or something? If the TPS thing doesn't work out try having a look at the hidden filter. I'd also be inclined to run some seafoam through as suggested. Maybe there's some gunk somewhere you just can't find and if so, the seafoam should take care of it. Best of luck getting 'er running properly.
