The car drove fine up to the store but when I came back 5 minutes later it won't start. Vats is turned off and I checked all fuses and replaced the clutch safety switch, still nothing. I can hear the fuel pump coming on, but when I push start it, it cranks and runs for about 5 seconds then turns itself off. It doesn't matter if it's running at idle or 3k and just dies, it's doesn't stumble or anything just off like if you turn the key?? Has anyone seen this before?

 

And when it's running everything acts normal. And I'm running the ltcc instead of the opti.

 

Sounds ignition related, double check everything

And not trying to be that guy who points out the obvious
But you should check fuel pressure and possibly change the fuel filter

 

Starts & dies in 3 to 5 seconds is usually the ICM My buddies T/A did that last time Dunno what all the ignition system your runnin keeps & deletes but if youve got an ICM test it Use shbox.com & a multimeter As stated always check fuel pressure 43.5 key on engine off shbox will have every test youll need