the PCM could be shot. You have a friend with an lt1/auto you can swap just to check?

 

its possible that the computer is full of water as they aren't completely sealed for submersion. pull the cover off and check that. if its wet its junk and will do all kinds of strange things.

 

i pulled the pcm and disassembled it and it was dry completly.
scannned it and fixed the probelms and there was no change

 

The fuel pump comes on initally for startup, and then your fuel pump continues running unless your oil pressure switch stops it. Have you checked this connection?

If it starts fine, and dies every time like clockwork look into this. I've had to deal with this before, but it wasn't on an LT1.

Ben

 

i know i did too on my lt1 . this ls1

 

If your '99 LS1 was flooded, what happened to your '94 LT1?