won't start
 

I have a 94 3.0. only starts some of the time. Not getting fuel pressure when it won't start, getting it when it will. It will usually start after sitting but if you shut it off and try to start it again it cuts off and won't restart after like 2 or 3 times. I've replaced the fuel pump, fuel pump relay, and by passed the inertia switch. i am now at a complete loss as I've exhausted my expertise. Please help!!!