Engine missing at low speed & goes dead when you slow down.

Sounds to me like your not getting enough fuel change fuel filter and tak gas out of tank and clean it out a few times as the screen in the tank may be clogged also if you have an electronic fuel pump make sure it is working properly

Probly a vacuumleak. Listen for air sounds. Titen hoses etc. Cud b lowsp fuelmech or worn causing gnition components

Prairie 360 revs high but goes slow (45mph) - Kawasaki ATV Forum

www.kawieriders.com > ... > Kawasaki Brute Force/Prairie/Bayou
Oct 27, 2008 - 2006 Prairie 360, wife's ride, polar white, with 26" Swamp Lites on SS108's. ... that it has a low top-speed...45mph is about as fast as they seem to go. ....air cooled motor theres no real performance there, the P360 wts are light ... Can't put 2005 Kawasaki KVF 360 into gear
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first try with air breather open then with air filter off,i had one that filter looked good but wouldnt let air thru

Solid state ignition has a capacitor that must charge and when the right time comes a SCR will dump the charge into the coil to make a spark. There is a minimum voltage that is required to trigger the SCR and at low RPMs that normally is close to being not enough. Most likely you will need to change out that CDI ignition or check the coil in the magneto, it may need to be adjusted closer to the flywheel.

Sounds like a fuel system delivery issue! Have a professional clean the fuel system and clean and set the carb. A new or CLEAN AIR FILTER is required.

Check your Air Filter, clean it out, check for obvious blockages. Change the filter if it looks well used (look for excessive dust or color change on the inner part of the filter) or obvious wear.
Check for other blockages around the air filter inlet.

Check the spark plug, just change it for a new one so that eliminates that possibly.

Check your fuel filter and replace if needed.
Check the fuel tank for corrosion or dirt in the fuel. Empty it out, Clean it and add new fuel, be sure you have the correct fuel.
Check your Air / Fuel mix adjustment screws on the carburetor.

Hope that helps a bit
Good Luck

Belt. Change your belt and ensure that water isn't getting in there. If it's wet or destroyed it will do that.

sounds like its running rich. check your float height and then lower your main jet needle a notch