well we tested the tps as well and it came back bad, it has a bad spot in it and its very intermitten. I got a new tps from a junkyard and havent had time to put it in yet, but it seems like this is a seperate problem. If you hold the throttle in a certain position it fluctuates 500 rpm's up and down, and when driving as soon as you let off the throttle it slows down instantly, and then when you give it gas again it jerks, because the tps. Its very wierd because the problem this tps is having seems like it couild have been the problem the entire time, but his unplugging and plugging wires back in obviously fixed something and it wouldnt effect the tps, the CEL is still on and never went off, so I dont think he reset the computer. I will get the tps on as soon as I can and let you know the verditct, but so far so good when it comes to the bucking.