1993 Ford Escort

At Halloween someone put sugar in my tank, I drove it about 50 miles before it stalled. I've pulled the tank, replaced the pump, filter, had the injectors cleaned professionally, I pured hot water down the in and return lines and blew it out, I also cleaned the fuel rails while off the engine. The car does the same thing, it will start right away and drive normal until I hit 20=25 mph then it just stalls like it loses all power? Please help before insanity hits me. I don't know what else to check.