So at the beginning of last season I replaced the carb because it had a stuck float valve. Mower ran great last year. This year, the mower started up just fine and is running well, but while mowing the throttle slips from the fast setting to slow setting. I keep moving it back to fast, but this is kind of annoying. Anyone have a similar problem or ideas why it would start doing this all of a sudden? Thanks for any help.