2500 mule need help

[jmooneyham]

hello im sorry i posted the wrong info about a mule yesterday i said i was having problems with a 550 mule but its a 2500 mule. i work for a construction company that has many. it starts fine runs ok but bogs out when your driving it doesnt die just bogs down then picks back up and takes off but it keeps doing it i have put a brand new kawasaki carb on it i purchased at the delership i have checked spark it doesnt loose spark the gas tank doesnt hold pressure im kinda out of options if you could help i would greatly appriciate it thank you for your time

[RCW]

I presume you have tried it with the fuel cap removed, and the problem remains.

Then I would look to the fuel pump or fuel cut relay, or fuel filter, or faulty or plugged fuel pick-up tube in tank, or the key switch is faulty and losing contact which means you have to test both the fuel cut relay and the key switch independently.

This assumes the carburetor is correctly jetted and the float level properly set.