Why when i have my car in neutral it just shuts down, or when i put the car under heavy braking, it just shuts off, I was thinking that i adjust the idle screw and see what happens, what do u guys think??
IAC = idle air control valve. It lets a certain amount of air into the engine when the throttle plate is closed. If the IAC is clogged or restricted, the engine will stall because it is being starved of air.
The TPS is the throttle position senser, located on the throttle body. When you open/close the throttle, the tps moves accordingly and sends a signal to the computer saying what the position of the throttle is. This is why you usually need to adjust the tps after installing a new throttle body.
I still believe your problem is the IAC. They arent too expensive, I believe probably 30 or 40 bucks but I'm not too sure. Replace that and it should fix your problem.