Low idle only when cold, and random at that. Car will fire right up and idle at 400rpms instead of around 900, volt meter is around 12. Give it some fuel it comes up along with oil pressure (middle of guage at idle).

I had a weak neverstart battery from wal-mart traded it in on new battery (gotta love warranty's). I put the new battery in and same issue. So I just gave the car some fuel and let it idle around 1k. Turned it off then back on and it was fine.

I have not gotten any check engine lights

I put a new opti on about 7k miles ago. Stock car more or less. Problems with low idle just started.

Any ideas, fuel pump, alternator, act of higher entitiy

 

Ever checked or cleaned the IAC?