问：开启后，汽车在装备时关闭

I turn on the car and it idle a bit high but once it warms up and I change It from park to reverse and/or drive the idle drops low and slowly die out and it stalls out some time even before I switch gears but if car is still warm it will turn back on but I have to give it some gas I just had a oil change done less then a month ago but at that point when I get it back on a bit a smoke comes out my muffler as I give it some gas to keep it alive check the battery altnator is go not sure if my exhaust system is to blame or if there is water in my gas tank car shut off and sometime won't cut back on till it cold again plz help a brother out

我的汽车有164000英里。
我的汽车有自动变速箱。