My big dog was running fine in the morning but when I rode it later on that night it felt like it was running out of gas. It was low so i filled it up and rode home. While riding it felt like it lose engine power in short stints. When I got home I noticed that it was making a rubbing noise while in idle and while running. I couldnt tell where it was coming from. Any ideas on what would be causing this or where to start
