I was running my 359 on the weekend & every time I started it up, after re-fueling or just shutting it off for a couple minutes, it didn't want to rev-up. It would just bog when I pulled the trigger. After idling for about a minute it ran just fine until I shut down again. First I thought it just needed to warm up, but it did it even when warm, so now I'm thinking it's some kind of fuel delivery problem. Anyone got suggestions?