Car Troubles. 2005 Mustang V6 Automatic?

Ok so here's the run-down of everything:
Car is a 2005 mustang conv v6
Was driving on the interstate (got about 80mi from home) when the car lost power (rpm) and cut off. I felt it loosing power and managed to get over to the shoulder before it cut off completely. I managed to crank the car back up but when I put it in gear and gave it gas to move forward, as soon as I press on the gas it cut off. (Car will creep forward if I remove my foot from the breaks but
As soon as I give it gas it dies).
Had a code reader hooked up to it and the code that came up was for the butterfly-door in my throttle-body being stuck closed. Took it off, cleaned it, put it back on, and it still kept
Getting stuck. So I bought a new throttle bottle and had it installed.
I also replaced the alternator, all of my fuses inside and outside under the hood. Still won't crank. I don't think its my starter, there's no clicking sound when you try to crank it. Also, once I changed The throttle body all of the codes went away (there were no codes showing at all)
Anyway, finally bit the bullet and took it to Ford. I was told that when you do repairs on Ford vehicles that sometimes the computer needs to be reset etc… Anyway, these crooks at Ford tell me that That I need Motocraft spark plugs. And want to charge me $390.00 to put on spark plugs.
So I have my car brought back to me, buy the motocraft sparkplugs and put them on and it STILL won't crank.
What else could be the reason my car's not cranking?

Not "cranking" has NOTHING to do with the spark plugs. You're obviously not knowledgeable or competent enough to address these problems. Take it back to the dealership.

Troll troll troll.