Throttle Position Sensor?
"Turn the key to the on position but DON'T start the engine. Now press the gas peddle to the floor SLOWLY and let it come up/back as fast as you can, turn key to the off position. Now do this two more times."
^ yep that's it. you shouldn't have any problems if you do that.
hey alsotropine did you replace that tps and did it help. my truck started doing the same thing a while ago and it drives me nuts. getting the plugs and cops done this weekend hope it helps but it doesn't feel like ignition to me i allways got the impression of fuel issue.

