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When it fails have you had the computer system scanned to see if there are any fault codes setting?
Okay well unfortunately with out any fault codes Im not sure I can do anything as well. I will open the post back up for you and perhaps someone may have something to add.
Is it harder to start the cooler the weather is? Does it start and run fine once it is warmed up?
if you have a couple of bad injectors, there may be one or more that is sticking open, this allows combustion pressure back into the fuel stalling, I would replace the two bad injectors and that may fix your problem. I would have a Ford dealer run an enhanced injector balance test on the engine when it is cold and first started, this will show any injectors that are getting weak as well.
I wouldn't change the sensor unless it is leaking oil externally or the reading is high with the engine off and key on. It should read .18 to .23 volts wit the engine off and key on with 0psi.