1994 Blazer wont start

[ATC mechanic]

1994 Chevy Blazer will not start untill it sites for about 1hr. It has spark and the fuel pressure is reading around 55-61psi. what im basicly saying is that once it sits for about 1hr. it runs for like 1min. or so and it stalls out.... i just got done replacing the engine and it ran fine for 5 days un til now and all the ignition and fuel pump and filter is new.....ty

[MT-2500]

Originally Posted by ATC mechanic

1994 Chevy Blazer will not start untill it sites for about 1hr. It has spark and the fuel pressure is reading around 55-61psi. what im basicly saying is that once it sits for about 1hr. it runs for like 1min. or so and it stalls out.... i just got done replacing the engine and it ran fine for 5 days un til now and all the ignition and fuel pump and filter is new.....ty

Watch fuel pressure when it stalls/quits.
Also watch for lose of spark to plugs.
Any check engine lights or codes?

[ATC mechanic]

the only code thar came up is for the wire under the dash being unpluged.....but i erased that code bc that was from timing it when we got this new engine in ill let u kno the other info then.....