hmm...well, I had carb trouble with mine, and finally had to have it rebuilt. Cost under $100.00 and well worth it. They told me that the ethinol they are putting in the gasoline these days has been messing up a lot of carbs. I´m not sure about the fuel treatment, but after I had the carb rebuilt, I´ve been running great...until my dog dumped it on the accelerator side and it was sticking for a few days...it´s mostly worked out now....good luck, don´t give up... the farting sounds like it´s running to rich and getting to much fuel...