CHEVROLET IMPALA IGNITION SWITCH KEY

I Have A 2003 Chevy Impala That I Bought Used A Little Over A Month Ago. It Does Have A Security System Built In It. However The Key Dont...

Whenever I Turn Off The Ignition And Remove The Key, The Engine Continues To Run For About 15-20 Seconds And Then It Will Shut Off. I...

Keyless Entry Only Works Inside The Vehicle.