I have a 2005 Camry LE 2.4L. It had been running fine until Friday, when the battery died. I replaced the battery on Sunday night, and Monday (today) while driving into work the RPMs kept dropping to ~500-250 whenever I stopped and if i sit too long (without giving the car more gas) the car stalls. Any ideas?

 

In cases as this, the cars engine can take while to come back to normal operation (the computer is adjusting itself).

Suggest you drive the car for a while, typically engine operation should return to normal sooner then later.