I have a blower that will start and run for a few minutes then die out....very hard to start after that. I had to replace some fuel lines, before I replaced them the blower was working fine....now its hit or miss. Also, my echo weedeater is shaking on the engine end. its never really done this before. I don't mean a little shaking- if you hold it with one hand it feels like arm is gonna vibrate off. Any insight?