hyundai santa fe 2004 stick shift engine,rpms are going up and down turns off

What is your question?

hyundai santa fe 2004 stick shift engine turns off, rpms are going up and down engine turns off when Idle some times, when driving when I have to slow down and switch gears or go into neutral engine turns off, when I turn my AC on, the rpms sometimes stops going up and down for a while but start up again later, driving in urban areas where i have to stop and go and make turns cause engine to turn off, there is no problem turning my engine back on though, driving on the high way as long as i don't have to stop or slow down and shift gears i have no problems, I have replace the engine and alternator, spark plugs and booties, and bunch other things, thinking it may be computer but I don't know.

What makes this problem better or worse?

when the engine warms up it starts acting up, when i have to slow down and down shift or go into neutral

How long has your 2004 Hyundai Santa Fe had this problem?

for 3 months