1995 Toyota Corolla Keeps stalling and running rough.

I have a 95 Corolla that started to miss a little when I was driving it and then it started to have trouble at stop lights and at stop signs. It would run roughly and it would even stall. After the stall it would start right up again but when I tried to exellerate after it didn't want to go. It would just chug and not get over 20 mph and then would go a few blocks or a dozen feet and then it would stall again. Then you might start it again and it might do the same thing or it might just go like there was nothing wrong with it until the next stop light or stop sign. I got a new fuel fitler and a guy cleaned the manifold (I think it was the exhaust manifold) and he thought it was bad gas. After he thought it was bad gas I used it for a week or so making sure I kept it full with high grade gas and it seemed to get better but then I let it go down to a little below a half a tank and filled it at a different gas station than I got the "bad gas" and it got considerably worse. It seems to go well in the morning when it has had a rest and it goes okay to work.1.2 miles but if it goes any further I almost get stranded (sometimes do). Earlier today I just went about 8 miles and it stalled out about 12-15 times. That is about 4 places it stalled and about 1-6 times I tried to start it at each place. Sometimes it only goes about 4 feet before it stalls again. The feeling is that maybe it isn't getting the gas or air properly but I really dont' know that is just what people here have said. Any thoughts? My car is too old for the codes.I tried that. Couldn't have anything to do with transmission fluid being low could it? I have a horrible time checking that. I usually have to get help with it. Any thoughts would be helpful on all of this.