After leaving my stereo on for hours battery went dead. I had another car give me a jump start, for some reason it didnt want to turn over, it finally did, but now my idle seems very low around 500-600, and it feels as if i had a vacuum leak from a pcv valve or something.

 

takes a while to charge up thebattery long enough for it to give the igniton system enough power... after draining a battery sometimes it kills one of the cells. you might want to get the charging system looked at