One thing to remember is that even the pressure may be good there may be a concern with volume. To check this start the vehicle and while it is running depress the fuel valve or open the port on your gauge. The engine should not stall. I don't think the vacuum line on the regulator would cause this. If it were off then you would have higher pressure. One other thing to try is to clean the idle air valve. It may have carbon on the the tip causing it to learn a higher value. Just remove it and clean with carb cleaner. Just a few things to try