I just bought a truck with a random cylinder misfire. Little back story on the truck, it was this guys brothers who passed away, he parked the truck and it sat for over a year. I went to look at it wouldn't start, i noticed a spark noise which i then saw coming off the distributer was chewed through by a rat. He grabbed one from another truck and it started right up. Truck was misfiring badly, which it threw the could p0300. Could the gas that is in it atm be bad we put a gallon of fresh gas in but still running rough. Thanks for reading and feel free to ask any questions.