Have replaced fuel pump, fuel filter, fuel pressure regulator, all cylinders are firing, check engine light not on.

 

well that just sucks...

hmm. i suppose i should try and be useful.

i can't think of a single thing besides faulty grounds, loose wires that would do it. does the car literally die the second it starts moving or is it random once you're moving?

 

are you leaking any fuel ?

 

It's random, usually after about 1/8 mile...

 

Does it idle fine, and can you Rev it freely?
Did you mark where the distributor lined up to have the ignition timing correct?
Did you replace fuel pump with OEM or aftermarket that you had to wire up?

 

Yep- check timing x2.