Does your engine have Champion sparkplugs in it?
I would replaced the spark plugs with a set of Autolite plugs.
Pull the plugs and look at them. One may be gas fouled.
Another area is the air filter. When was it last change? Is the filter a Briggs and Straton filter? The material Briggs uses in their filters may look ok. They will plug and cause the power loss like you are expenencing. A good way to tell is to run your Van Guard engine without the air filter.
I have a 16 HP Briggs Van Guard that did the same thing. My Briggs will foul a Champion sparkplug out every 10 to 20 hours. Never the same cylinder. My Briggs has a coil for each cylinder.
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