Zero Turn Mowers

After only 2.5 mows with a brand new MZ 52, kohler 7000 series 25hp, it started sputtering and dying. After letting it sit for a while, it'll start back up and idle for as long as you want, but once you start driving or mowing, it'll do the same thing, sputter and die, after just a few minutes. You can save it by choking it sometimes, but it doesn't last. I replaced the fuel filter, thinking maybe it had some junk in it from the start, but that didn't help. Also put a new tank of gas in. Also no help. I don't wanna do anything wrenching, so as not to void the warranty. The pickle of it is, that I purchased it online, and had it shipped from 9 hrs away, because it was a great deal (or so I thought). Trying to contact someone that'll do warranty work for me here, but was wondering if there's anything else I could try in the meantime. If where I bought it were close, I'd have already been there raising heck. Very frustrating. Any advice?