TitaniumMoe

hi i have a 1988 gxl with a 13b streetported motor, motor has 60,000 kms on it it runs perfect, today i did a rad flush by draining all the fluids. Took the Rad hose and Heater hose off and took all old prestone out. Next i put a water hose to the Rad flushed it with fresh water, and did the same by putting the water hose on the Heater hose and flushing the indside of the engine. Aired the inside down. Niuce and clean. I put fresh prestone in thier nad let it idle 25 mins, Perfect Temps didint have to bleed her. Now after i drove it kinda feels like she has a bit of hesitation when coming to a stop or declerating, Idles perfect. accel\erates perfect. But decleration is kinda not smooth and also its an Auto [soon to be 5 speed] . So wut could have caused this guys and any advice on how to fix it. PLZ HELP!!!