I recently did some trading and got a nice little bobcat 610 with a wisconsion motor. Runs good, starting to use for side work and I was leveling some crush rock for a guy and it ran low on gas, it loves the gas. After I filled it back up, it ran rough, was blowing blackish smoke and running rough. I finished smoothing out the drive way and loaded it up. Got it home and it ran the same way. Realize it had gas dripping out of the hose from air filter. I have put a new gas filter on it last weekend, haven't done plugs and wires yet. What would be a correct fix? I need it to be more dependable then what its doing now. Thanks in advance for the help.