I have a 2003 Corolla with 129,000 miles. Was driving across mountain the other day and CEL came on. No problems with the vehicle. Runs very smoothly. I had the code checked at Advance Auto and they said PO301 misfire. With no noticeable issues with driving the car, what would be the reason for the code? I had oil change a couple of weeks ago and they said I needed fuel injector service, so I let them do that, don't know if that could contribute or not. Any ideas appreciated. Thanks.
