Car started misfiring tonight along with SES light flashing. Pulled codes, the only current one is PC 0300. Been reading up on past threads and trying to get a game plan for tomorrow. I will start and look at the air filter, plug wires and spark plugs, they have approx 50K on them and then move on to the coils. What is the best way to check them out? I was going to hook my timing light to each plug wire and watch for any inconsistencies. Any other suggestions?!?