power failure

does the car not start after you lose power or does it start back up if you try?

hopefully jrichker will see this because im sure he has an answer for you. i dont know the exact numbers or if it is the problem....but its probably your throttle position sensor.

when was the last time you changed the fuel filter?

and if jrichker posts, he has a whole list of things to do. so you can narrow your problem down. he's the man at this stuff.

yep, you need to isolate it more. it could be fuel, ignition or anything else. have you pulled codes?

i would play with a fuel pressure gauge. see if you are losing pressure at higher RPM's....does it do it while idling or just under load. have you run with this set up before, and did the car run ok?

you are not running platinum plugs?

as ECU said, for TPS check: connect a DMM to the ground wire and return line. based on your problem, i would sweep the throttle through the range of motion. do the volts go up is a clean sweep or are there breaks? base should be under 1.0 volt. WOT is about 4.5 volts (normally +/- 10%). make sure your voltage does not take a poo at WOT.

that is all that comes to mind.
good luck.

since i saw this and it could be similar symptoms, i will link to it in case it sounds plausable.
http://forums.stangnet.com/showthread.php?t=394332