After running 20-30 minutes, my John Deere 318 garden tractor intermittently bogs down like the choke is stuck and the engine is getting too much gas. Then it will run fine for a few minutes, then bog down again for a few minutes, etc. Choke cable not stuck, fuel filter and fuel pump replaced 25 hours ago. Could it be bad spark plugs or carb gum-up?

jfergus404, September 2009