WTF possible pats problem?

I'm having a problem with my 02 GT.

I had recently (about 2 weeks ago) done some other work under the hood, and I had the wire that goes to the fuel pressure sender off?(thing that regulates the pressure electronically)

Anyhow while driving today the car stalled out on me, when I popped the hood that clip was disconnected, I connected it back and the car ran for a bit longer then died again.

I've put a fuel pressure gauge on the car and it reads Zero, the fuel pump is also not coming on. (yes the car has fuel in the tank, it is also not the safety switch in the trunk) Whenever I put the key in the gauges go thru a full sweep, the odometer reads nothing but dashes, the fan runs and the theft light flashes. I had my mechanic run a diagnostic with his snap on scanner (my predator and cheaper scanner would not work for some reason) and it gave a PATS error. (the chip is still in the key it hasn't fallen out)

Is there anything we can check or reset in hopes of fixing this or is a dealership pretty much the only action we can take?

Thanks for any help

I only have One key ... but It started up fine this morning .. and when I shut it off it did the same thing it was doing yesterday .. and while it was running I gave it some gas .. and it cut out at about 3000 RPM's almost like a rev limiter so now it is an intermittent problem