I have a 2000rs with a wrx swap. Recently when driving sometimes the car will cut out or hickup when accelerating, almost like if you were to hit fuel cut. This does not happen every time i drive it, only when driving for more then fifteen minutes or so and even then sometimes it will not happen. it occurred around 2500-4000rpms but its not always in that range. Another problem i notice when this started to occur is that the reading on my voltage gauge is all over the place. it will stay around 14v most of the time but when idling or first starting it will drop to around 10-12 and some times even lower, also when under a heavy load, such as rear defrost, wipers and radio, the volts will drop around 10v. The car has also been stalling some times when idling. ive had the alternator and battery tested and that came back fine, but i have notices some battery acid leaking out of the battery, im going to fix that asap and see what happens. if anyone has anything to add that would be great.