1994 180,000 miles Moving and STalling Problems.

Ok, So I piad like 1,100 for this car and it ran good for about 2 months then all of a suden when my car was about under 1/4 a tank, it started to stall and would chuge wicked bad. It would be fine cold, but when warm is when it happend. I would lose total power and have to turn off my car for a sec, then turn it back on and I would have FULL POWER for about 30 secs then it would die down. After a couple of weeks, this problem got worse and I had to have atleast 1/2 a tank in order to not have problems and now I'm at 3/4 tank I have to have in order to run right. Things I have replaced are FUEL PUMP AND SCREEN AND FUEL FILTER AND ROTOR AND PLUGS AND DISTRIBUTER CAP. I still have the same problems. I have a hole in the manifold pipe running from the converter to the manifold, but I wouldn;t think that it would make a big diffrence becuase it has always been like that. Also, if I am in Park and I rev up and engine and just let go of the GAS, my car will stall. Whats Wrong? Thanx In Advanced.