I'm actually not having any codes, just car has 72K miles and part throttle is a little not-smooth if that makes any sense. I have no record of plugs being changed so I figured I would change them first then if it still feels choppy to investigate walnut blasting. Thanks for the responses, Amazon (yes really) has the plugs for $78 a set so I'm going to order those and defer changing until next weekend. I'd ordered the Bosch ones from NAPA online but apparently they really don't have them when I called the store today to see if they'd come in from the warehouse
