lets see started with the f/o test procedure i have 62 psi at start up and maintains 58 psi at idle in park and in drive... i have an issue where the truck will run fine all day at idle but after it has about 15-30 min of op time it will want to stall now if i pull it into neutral and pin it it will spit a couple of times and rev out fine but from that point on it will sputter sparadicaly almost like it hits a roaming rev limiter as for the ignition circuit i have replaced the ign ctrl mod the coil plugs wires cap and rotor i am at a loss here and have followed alot of the threads to no avail. hoping someone has had similar issues. thanks in advance. oh and no codes or check engine light has come on.

 

What f/p test is that? You didnt get it here... running fuel pressure is incidental and only after establishing engine off prime/ leakdown.

But I would suspect your EGR valve. Pull it and clean it.

See this:
https://blazerforum.com/forum/engine...48/#post511927

 

Pettyfog is right, did you get the code read?

 

there is no code and the leak down was non existant it primed to 64 and didnt drop below 60 after 15 minutes i did a running test for psi and to check volume which after accounting for the gph rating for the pump dividing by 60 and then bleeding into a beaker was also sat. egr is also fine new valve was installed..when i installed new intake manifold gaskets that i found had failed when i conducted a smoke test starting to think about computer will have to pull and take to chevy i suppose better than buying parts or plan be drop a carbed 283 in it and get the boat anchor out lol

 

Disregard my post, just read that you replaced the ignition parts.....