When you spray the throttle body when the car is start,
It's going to die, you need to keep one of ur hands on the throttle to keep it alive.
Also once clean it throughly while the car is off, open the the tb using the accelerator wire or as ur comfortable, keep doing it till u stop seeing carbon being washed off.
After this starting might take time, But its suppose to do like this, Then again spray it while the car is start, dont worry if the carbon deposit is going in the engine, it'll come out of the exhaust.
But if you arent willing to risk, take it to mechanic he would open it up clean it properly. Charges should be around Rs.600-1000