Hello to everyone...Although I am new to this forum...I have been reading along for a couple of years...as the knowledge here is second to none. Having said that here is my problem. I have a Cub Cadet 2165 Rider with a 16HP B&S Intek engine. The unit only has 197hrs on it, and was bought new in 1998. My problem is I can cut grass for approximately 45 minutes and I hear it start to "Die". If I Immediately pull the choke out, it will continue to run for a short time before it finally dies. I then can immediately restart with the choke fully engaged and it will once again run for 30seconds to a minute before quitting. This scenario can be repeated over and over, but it will not run with the choke in...nor will it allow me to engage the PTO without shutting down. As soon as the unit cools down....it will once again run fine for approxiamately 45 minutes and the scenario staqrts again. Thus far I have: Replaced both spark plugs, Cleaned both elements of the air cleaner, replaced the fuel filter with an ethanol compliant filter, replaced the top end fuel lines, fresh oil change and filter, thoroughly cleaned the "breather element" of the gas cap. (As a matter of fact, this evening when it began, I actually unscrewed the cap before it stalled in case it was vapor locking....NO Help) Drained the gas tank and cleaned throughly and filled with fresh gas With Ethanol additive, as well as Seafoam. Guys I am out of possible answers....and I can only ask for your help in diagnosing what is going on with this unit. Any help greatly appreciated, and Thank You For Your Time.