There are quite a few reasons for happening. The first one could be a worn-out valve tip. It can also be too much debris accumulating on the tip of the valve, which basically tends to close it somewhat.u003cbru003eSo, the fuel travels towards the blow constantly. This floods the engine. In very serious cases, you may discover gas-soaking air filters. Also overflowing the carburetor takes place. You can also find some on the parking ground.