2000 Toyota Camry Q&A

2000 Toyota Camry Question: engine races and car stalls out when stopped

It happens sporadically, but yesterday i zeroed in and noticed that when the fan is on and the the defrost position is chosen and i come to a red light the engine races and sort of bucks. I tested it in other settings and it only happened with the fan on and the defrost setting???? I recently had a new thermostat put in and recently a new water pump. -
Answer 1
take it back to whoever did the water pump -