when i initially start my truck after 24 hours, the idle is at 2000rpm for about a minute to 2 minutes. when i tap the gas and rev it a little it comes down much faster and idles the way it should be.

do i check if the tps is broken or if the power to the tps is broken? i am not spending $38 to find out that is not the problem. i have a spare one that is used but haven't got around to finding it yet.

 

Could be the air idle bypass valve, could be vac leak somewhere, as stated the TPS could be out. Have you pulled any codes on it, is the check engine light on.

 

Pull codes to be certain about the TP sensor. As you said, no point in spending the money unless you are certain it needs replacing. The symptoms could be indicative of nothing more than a vacuum leak.

 

no codes. doesn't even blink

 

Um, worst case scenario, it will blink twice, pause, then twice more. If you have a newer PCM, it will blink thrice, pause then thrice more. Code 11 or Code 111 is the "System normal" feedback that is generated when the KOEO and KOER tests yield no fault codes.

 

the old computer that was in it was off the hook, it would not stop blinking no matter what you did.
i switched it out for a different computer with an unknown year and i have not seen it blink yet other then putting it to the floor for about 30 seconds, but even then it blinked once



there is virtually no way to get anything out of these computers. the basic on off turn wheel and idle speed test is all you can do other then look at the blinks

 

You can clear codes (and theoretically stop the blinking) by disconnecting the battery for about ten minutes.

The PCM's are model, engine (and year to some extent) specific. Arbitrary replacement could be the root of the problem. The PCM blinks out a series of codes. The more stored codes in the memory, the more it is going to blink. Not only that, but they blink out a short code initially to indicate the number of cylinders of the engine they are controlling and then blink out codes TWICE. So, an engine with a litany of fault codes could theoretically have a PCM that blinks for a few minutes.

 

so if i plug the old computer in, the codes will be erased? i thought the computer was bad because it was only throwing codes when i was driving it and goes away when i am at idle.

probably the TPS right?

 

If you refer to fordfuelinjection.com and have a very good multimeter in hand you can test the TPS before guessing it is bad. Greystreak gave you the best advice and that is figure out what you did on your compter. Pulling codes gives you the list of symptoms that the computer is seeing when it looks at the available sensors, and feed back when the actuators do not return signal that is expected. Though your truck only has a few key systems monitored ( EGR, Exhaust, RPM/cylinder position, engine temp, and Air monitoring) they are the primary ones, except for the fuel system, in getting the motor to run effeciently. A multimeter is a very handy tool for a more indepth examination of all those sensors and actuators to see if they are reacting accordingly, and to find problem wiring as well.