Tboone66

I have a Axis 500 with less than 10 hours on it. Runs fine when first started but after 20 to 30 minutes of run time it sputters and mises. I can cover the breather and it will run but as soon as you take your hand off of the intake it does the same thing, so I know it is a air/fuel ratio problem but don't know what sensor it could be. Repair shop says 6 to 8 weeks to look at it. Anyone had the same issues? Also, where would you be able to get parts?