Cost of Idle Air Control Valve on 2001 Mitsubishi Galant

Bought new battery, now car stalls when a/c on,

check you idle air contriol valve. its connected to the throttle body
Go purchase a cam sensor for $60.00.
1 more answer
Perhaps you need only a throttle body cleaning or idle relearn procedure. Please review the following RepairPal article regarding battery replacement and idle speed -