i got a 94 Z when you hit the key it don't start the frist try hit it again it starts right up it cranks good , but it don't start the frist time i checked the fuel pressure when you turn the key on and its fine but it goes right back down when the pump turns off , help if you can i don't know what to do to it thanks

 

Sounds like your fuel pump..

Exactly how my car acted when it needed to be changed