Those voltages are fine. I use 0.5 to 4.5 volts in my classes but those are just approximate and are just for discussion purposes. To set a fault code when the 5.0 volt feed wire or ground wire breaks, the signal voltage will go to 0.0 volts or 5.0 volts. Those are what trigger the codes. If you unplug the sensor, there is a "pullup" resistor in the computer that will force the signal voltage to go to 5.0 volts so it will set a code.
A dirty spot on the TPS can cause a hesitation or stumble, and it can cause a fault code to be set in memory, but it will not cause a misfire.
Thursday, November 29th, 2012 AT 8:47 PM