I recently purchased a 2005 Silverado 1500 and it came with two keys (both well used) that appear to be perfectly identical. However, one of them always turns the ignition with no issues and one of them turns the ignition only after wiggling it for several seconds.
There must be some imperceptible difference between the keys but I'm trying to decide if it's more likely a bad key or an ignition tumbler that's at the end of its life. I know they're both pretty cheap fixes but I was wondering if anyone has any insight