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Originally Posted by GMMerlin
I think you are looking at 2 seperate problems.
Since you have a cylinder specific misfire, I would start there.
Possibility of ignition or fuel related. I would start with ignition because that is the easiest .
You can start by swapping plugs and wires and see if the misfire goes away.
In my experiance with an idle misfire, I would look towards the fuel system (possible lean injector).
With the TPS, it is an important imput to the PCM It is a simple 3 wire potentiometer and diagnosis is fairly straight foreward.
The important thing was the code..was it a performance, low or high voltage code?
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It was P0121 Throttle Pedal Position Senson/Switch A Circuit/ Performance Problem. It then says that the computer senses a problem with the throttle circuitry. I agree that I should start with ignition and the cars due for new plugs and wires anyways. The misfire is not continuous so it may be more difficult to pinpoint. I'm not sure if this matters or not. Thanks