Just bought a used 2003 350 Rancher. Was running great for the few first hours. Having problems when giving it any gas it bogs down, wont go much over idol. while limping home all of a sudden it was fine, went back out to have the same problem that day.. Came home changed the gas. Went out next day with no problems while headding home same problem. it works for few hours then the same problem.

 

i got it from a dealer as is. spark plug and everything should be fine.