Car has a k20z3 motor car has been running great but I have notice a slight jerky reaction from off to on throttle and it seems to pick up a bit late after applying the gas. Today it was worse I noticed a distinct jerky throttle and a delayed pick up arround 2-2500rpm. Now as I'm driving down the road the car cuts off an loses power. It cranks over, but won't start up. The fuel pressure regulator reading 0 so the it's picking up the car isn't getting fuel. What do you think it can be?