I put in one of the aeromotive FPRs with a vac line when i put in the fuel rail i made. So I can see that the fuel pressure isn't dropping when I rev and release the throttle.
I am thinking it could have to do with the AFM adjustment, a vac leak somewhere or electrical connection. The idle also sometimes hangs up at 2k when I release the throttle. It will sit there for a second or two then drop. When this happens I can see that the AFM arm sits at a spot before dropping down...Not sure if this causing the hang-up or just an effect.
There are just a handful of janky areas from previous owners so its taking me a while to figure out what each component is supposed to looks like when adjusted correctly.