92 4.9 inline six won't start till 20 or so trys after overnight sit. Fuel press. good ,fire good .Is there a cold start in ecm or a sensor to open injecter .Use starting fluid fires right up.

 

fuel filter could be clogging

 

Check the computer for codes. This will tell you how: https://www.f150forum.com/showthread.php?t=10907s

I put this in your intro too:
You need to do a fuel pressure static test. This is a test to see how fast the pressure drops after the fuel pump has shut off. If it drops quickly there may be a problem with the fuel pump, regulator or a blockage in a line.

 

Scaned codes got a couple that do not pretain to problem cleared codes tried to crank and wah-la it started right up.So i decided to check the timing since it has never been checked in 16 years. and going buy the only mark i could find on balancer.I put the light on it and it showed up on the bottom of the engine say about 6 oclock( and yes i did unhook the computer time wire)

 

What codes did you get?

 

egr flow and o/d switch.But yesterday when i cleared codes it starts right now