I have a areomotive fuel pressure regulator and a lot of people told me to run at 40lb's of pressure, well it seems my car doesn't like 40lb's it likes 30 better. It would stumble, bounce in idle, stall and ran real rich. I backed it down to 30 and it runs like a race car. I dynoed the car and Sam told me the fuel to air was almost perfect, he told me he wouldn't change it. We had it at 5300 rpm and even up there he said it was fine.