rough idle then stalls

i have an 05 fusion 900. runs fine, but wont idle so reverse is kinda out of the question.

changed fuel filter, ran seafoam through it, checked intake boots for leaks. no help. so i took it in to the dealer to see if they could adjust the TPS. just a guess on my part. they said the EGT senser was bad, so they replaced that. still wont idle. now they say that the fuel pressure is over 100psi when it should be 58. they "think" its the fuel pressure regulator. they are waiting to hear back from polaris bc they think that should of been replaced during the tank recall.

since the pressue is almost twice what it should be, im wondering if it could be a bad injector? the shop doesnt think so, but then again, they tried to sell me on the idea that the EGT was the reason for my problem and i wasnt buying it. there wasnt even a fault code for it. just one in the history on digital wrench.

any thoughts or ideas??

one more thing, the voltage for the TPS on digital wrench was something like .88x volts while running. sound about right?

are you saying that the TPS being at .88 volts could cause the 100+ psi in the fuel rail? or are you saying to fix the pressure issue first. and then, that the TPS voltage could be causing the rough idle and stalling. meaning two different conditions..

if so, does the fuel pressure regulator seem a likely culprit for the increased fuel pressure?