What is the fuel pressure spec? Do you have the spider fuel system? That type system is known for problems. cold start idle issues? Runs ok after warm-up?

Fuel pressure spec that I was given was 56-60 at startup, idle around 55-56psi with a pound or two drop off at engine shutoff.
As fur the spider fuel system I believe I don't.
Air temperature doesn't matter and engine temp doesn't matter, I have had a no start for two days and after i got it towed to the shop the next morning it started and ran the best it has in a while.

You do have the spider fuel system. 60--66 psi, key on engine off. Psi is less with engine running. I'd check codes anyway, I've had inactive codes point me in the right direction. I need more info to go on.

I have check for codes before and I have none. As for me having the spider fuel system how do you know if that is the problem? What tests do I proform? My fuel pressure at key on engine off is 60-61psi. I have just finished running engine and spray brake cleaner around intake and twice I had a poping sound on the left rear side of the intake but I can't get it to do it again. In the area of the intake and the cap. The rpm did not rise so I don't think vacuum leak. Got any more ideas.

This info is for hesitation--sag and stumble, no codes.