Engine Performance problem
1999 Oldsmobile Alero 4 cyl Two Wheel Drive Automatic 186,00 miles
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I have 99 alero with 186,000 miles on it. Recently it has had trouble starting when the engine is warm. I dont have trouble starting it in the morning, but if I try to start is when it is still warm I have to step on gas right away to prevent stalling. It also idles unevenly and sometimes when I stop and idle for a bit the rpms go down and it stalls. Sometimes rpms jump even when I am driving on the highway.
I wonder what it could be.

Thank you