My vitara keeps stalling out on red traffic lights and stop signs

ok, thank you, but where is the mass airflow sensor located?....I located the mass airflow sensor went out and bought a cleaner for it cleaned it no effect, I also replaced the idle air control valve, it is better but it still idles rough and wants to stall out, what is wrong with my vehicle? I can't see paying 150 to 200 dollars to run a diagnostic on it, I have been trouble shooting it and the system led to either the tps, and or idle control valve, both are new now and I still have this issues, although it is running better. If anyone knows what is wrong with my vehicle please let me know. thank you