Oh yeah, one more thing. The fuel injectors can leak down when they get old and cause that symptom too. I you want to "hunt and peck", you might try changing the check valves first as they are cheap and relatively easy. Then, the air flow plate adjustment, but be careful, then the accumulator, then the injectors. I believe the pressure regulator is the next more expensive, and the fuel distributor is the big boy.
(Oh man, this car is sooooo fast.)