Boss

just bought a 96 corolla. in pretty good shape but im having a problem with it. ill take it out and it'll run fine for awhile (half hour or so) and then ill shift down to 2nd for a stop sign or whatever. then clutch in and brake it'll start gettin shaky and then stall. start it, it catches no problem then stalls a second later. start it same thing again. i have to peel out to keep it from stalling and once i get goin no problems. i thought i might have some water in the gas tank so i put some water remover in the tank 3 days ago. very little improvement. any thoughts or suggestions? fuel filter? any help would be much appreciated