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you have what is called high vacuum issue. your vent could be clogged. check the outside parts and make sure it is clear. the other thing that causes this is the pickup tube(where you draw fuel from the tank) usually has a screen in the bottom of it. these screens tend to get clogged with debris that ethanol fuel cleans from the inside walls of older tanks. pull the tube out and remove the screen. you don't need it. while your in there probably wise to replace your anti-siphon valve. the reason it would run low speed is that once you slow down whatever clogged the screen fell back into the tank and no more clog. more likely to happen at high speed
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