So I finally had some time to work on this. I checked the fuel pressure, when I first started it, pressure was at 5-6 psi at idle. When brought the rpm up the pressure went up to past 10 psi, maybe around 12 but 10 is as high as the gauge goes. When I let off the gas the pressure went down to 4-5 psi. If the pump is working properly, should the psi be at 6-7 all the time, at idle and highway cruising???
THIS IS YOUR PROBLEM. It sounds like whatever fuel pressure regulator you have is not working. Fuel pressure should never get above 6 PSI regardless of the engine rpm. If it's a mechanical pump I would replace that. If you have a carter electric pump it has no separate regulator so it would need to be replaced. Most Holley electric pumps have a separate inline regulator that can be rebuilt.
