I have a Canadiana 140cc 5.5hp model 7800905 and or how to tell if a mower does mulch thx

[B]I haven't any owners manual....do to aging and keeping the tools all lit up and ready to work..by myself. Well heres my problem; My weed wacker starts a liitle tougher than it did.But...once its running, If you try to give it gas .....by the trigger, It doesn't want to increase in speed this is after it warms up. If I slide the small "choke lever to start". It will run wide open perfectly.Pull the trigger at this point and it goes down and dies.The tool isn't 4 years old yet,but i am not sure about that.. I put new "mid grade" gas and 2- cycle oil mixed properly in it.The small plastic hoses.-------- i pulled the filter,,, out, Filter took air when blown air thru it,Have i given enough.info for anyones input on this?[/B] thanks much for stopping by to help bob s