husqvarna riding mower quits running?

2 year old /71 hrs. mower will start but acts like running out of fuel.airfilters clean,fuel filter clean,full tank fresh fuel.acts like starving for gas. just started last week.added some fuel system cleaner and no difference.oil and filter fresh. proper oil level.i am not mechanically inclined so have done all i can think of.
please help, grass gowing fast here in alabama