03 Impala Stalling

Hello Everyone, I have a 2003 Chevy Impala 3.8 "Police Package" and I am having a problem with it stalling when it gets warmed up. When its cold it runs fine. However when it gets warm it starts stalling, usually at red lights or stop signs or whenever I slow down. When I restart it and hit the gas it starts up okay. Its not all the time but occasionally. It seems to be happening more frequently. If anyone has any advice I would greatly appreciate it. Thanks!

Best place to start is to get a scan tool and pull the trouble codes. See what the computer is seeing.

Okay, I'll start with that. I'm assuming I can pick one of them up at a store like Auto Zone or a place along those lines?
Thanks for the help!

Some auto parts stores will pull your trouble codes for free