The genset on my 2010 350SS will start and run rough for about 10 seconds then stop showing the UU code. The generator is a 7.3ecd fuel injected Kawasaki powered gas motor. I have had the Kohler agents out several times to look at it but they have had no luck finding the problem. They have changed the spark plugs, the ecm card, and the fuel injector, as well as testing the fuel pressure (55psi) and doing a compression test on the motor which was normal. They also changed the impellor and the water flow appears normal out the exhaust. Any help would be great, the genset has 80 hours on the clock.