two things that i was just reminded of(i drive like once every 2 weeks):
first, when the car is not warmed up the idle will jump and drop from 1000 to like 2000 till it gets warm. but usually only when in gear.

second, sometimes it wont wanna start. it will turn over but wont fire. i only dose this once and a while. and then it will work fine in like 15 mins.