[jmatta]

Old batteries can cause all sorts of strange issues. It not only provides stored energy for starting, but remains a voltage buffer for the entire electrical system. My car experienced odd behavior and it all disappeared after replacing the battery.

On another note (not equal by any means), my son's Jeep Liberty was stalling for no reason recently. Battery had plenty of juice to start the car, but it would die at stop lights, not being able to hold an idle. I replaced the battery and all symptoms went away.

You may be fortunately that this is the only issue.