I pulled my ZT 219 out and fired it up. Ran crappy, sputtered, then died. Ran it off the left tank, and no problem. Went to my dealer and they said bad gas... Drained it all out, cleaned the tank real well, and put fresh gas in it, still sputters and dies, but still runs like new off the left tank. Any other BobCat owners have this problem at all? The gas runs the 21 inch fine. Thanks for any help.