I had the EXACT same problem change your spark plug wires, one or 2 can be bad which means your only using 1 or 2 cylinders tell me how it goes.
I checked mine by using a wiring harness piece I got from a junkyard and an ohm meter. I disconnected the wiring harness and connected my spare piece to the TPS. I checked the resistance of the TPS while moving the throddle around (engine off) to see if the resistance rose linerally with throddle and no sudden jumps or open spots on the variable resistor inside the TPS.silentkevin said:No, I haven´t checked the TPS. How should I check to see if it is ok? The computer didn´t report any problems with it.