ok so i went to this web site...
http://fordfuelinjection.com/index.php?p=30

and followed the directions to check the TPS voltage (sig rtn which would be the top pin and tp which would be the middle pin) and my readings are way off.

should be my voltage
Throttle Closed .901 4.13

~50% throttle 2.840 2.38

WOT 4.538 .35

they are almost a full 180 of what they should be. i tried switching the probes up, putting the pos. in the top and the neg. in the top and the voltages were the same ether way.

Am i looking at the specs for a different year or a diff model truck? any help anyone can give me to try to find the correct voltage or the correct way to measure the TPS voltage, is greatly appreciated. Please, FORD GURUS, I am desperate to find my problems.

 

What year is it?

 

my bad its a '98 f-150 4.6 triton v8. im having problems with the truck stumbling on accel. but once i get to speed it is fine. it is a little choppy at idle, but for the most part i am only having problems on accel. when my nissan 240sx had this problem, it was the tps then the maf. but the nissan it turbo and only a 4 cylinder so the problem was more pronounced.

im trying to find the correct way to measure TPS, MAF, Cam, and Crank position sensor and what the voltages they should measure at. if someone could point me in the right direction as to where volt. specs would be i would be eternaly greatful

 

Copied..... this in part is a reference to better performance ......

" Each time the ignition is turned on, the program resets the "starting point" in the TPS position table.
This action automatically adjusts for changes in the TPS resistance over time, temperature and wear.
As you know, this sensor gets the most use from movement of any in the system.
Yet their replacement is relatively infrequent over the average life of the motor.
This auto set function has been in use since 1985 in all the FI motors and across all the computer generations.
Bottom line, it makes little difference what the voltage is due to the way the PCM handles it each time the motor is started.
If the voltage goes too high or to low, there is a code set to alert to that type fault. Seldom do we see those codes due to the quality of the sensor and it's design.
This setting of the TPS is an old trick item and has not been noticed that the PCM will only change it's operating point after some relearning time, so does not really accomplish anything permanent.
Bottom line is you cannot take control away from the PCM, in reality, by making an external change of this type, no more than you can really change the idle speed unless you set the stop screw up, that is an illegal action unto itself and causes other malfunction, if done.
Setting the voltage may, on a temporary basis, seem to richen the fuel but will not stay at that level after the PCM returns the zero set and pulls the fuel back again."

Also from your posted link: "There is a TPS ratchet algorithm which continuously seeks the minimum throttle angle corresponding to a CLOSED THROTTLE position. This alleviates the necessity to set the throttle position sensor at an absolute position and compensates for system changes and differences between vehicles."

I doubt that it is your TPS giving you problems. Try cleaning the maf and checking for vac leaks.