Check the TPS wires, check it all the way to the huge bundle to make sure none of its wires get accidental cut or fuse up with other wires. I've had that happen to mine one time, then I separated them carefully and got the thing up and running great again. But I didn't have hard shift problems like yours out of the TPS mess.

If the wire chech doesn't do the fix, you'd have to replace that TPS, it's easy and not that expensive.

-Peter-

 

Well I'll go back. My father and I cut and soldered the tps wires to make them longer so maybe the connection on one is bad. I'll go back. I'm going to try to buy a tps for cheap on here. This is pissing me off.