OK for a couple months now I've had this issue that is very annoying, if I set the idle to normal it will idle but if I tap the throttle it will slowly die down, and other times it will slowly die down without tapping the throttle, and other times very rarely it will be fine. I have a volley black fuel pump and flowing a fuel pressure 13-15 psi when this is happening. Any suggestions?? This is getting very aggravating to deal with