I have a 1990 honda civic every time I drive it for 20 or 25 min. it always stops and will not move when the engine is still running.. I put it on nutrual then drive and it still won't move I recenly had the heads rebuilt and bought a new fuel pump, and yesturday I also bought the main relay because it didn't want to start... before I got the head rebuild the transmission was working perfect so what can it be...

ATXs are the weak link in FWD vehicles, especially if you don't change the fluid every 30,000 miles or 24 months, whichever comes first. Try changing the fluid and cleaning the magnet. If that doesn't solve the problem, you are likely looking at a rebuild or replacement.