Two weeks ago radiator leaked, only found out while driving as car started to smoke. I stopped immediately and had the car towed to mechanic. Mechanic advised head gaskit is ok but the radiator needs to be replaced because it was leaking from the bottom. Also the transmission fluid was low. Mechanic replaced the radiator and thermostat. Also flushed and refilled trans fluid because he thought there might be cross contamination (don't know why). After 2 weeks it appears now that the car is having problem in accelerating. Any ideas?