If the engine stalls AFTER it has started, it is NOT a PATS problem. It's a PATS issue if, and only if, the THEFT light flashes rapidly or stays illuminated after the 2-3 second PATS power-on power-on sequence. Starting will then be PREVENTED.

I've never heard of the "Xpress bypass kit", but it certainly won't negate the PATS system.

There's a good reason for the PATS system - it keeps the vehicle from being hot-wired and driven off. It's been standard equipment on Ford F150 pickups since 1999 and on other Fords as far back as 1996. If it was easy to defeat, it would be worthless. You're blaming the wrong thing since the engine starts successfully, an action that would be prevented by PATS if it were a PATS problem.

You're ranting up the wrong tree.