Thanks for the help. The plugs are new, but it did sit with some gas in it during our move for probably two or three months. I haven't always been the best about making sure the tank is empty when it's sitting (a big no no, I know). What would I need to do to figure out for sure if it's the carb? I did have to put a new boot on one of the plugs. It isn't exactly the same as the original boot, but it's what the dealer had at the time I went in.