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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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.
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