Tractor won't rev up?

I have a John Deere lt180 17 hp v twin Kawasaki everytime I try to rev up the motor it just sputters and wants to die. it's also hard to engage the blade without the tractor wanting to die and when I start to put it under any load like heavy grass she wants to die out. I need to get this fixed asap and cheaply... show more I have a John Deere lt180 17 hp v twin Kawasaki everytime I try to rev up the motor it just sputters and wants to die. it's also hard to engage the blade without the tractor wanting to die and when I start to put it under any load like heavy grass she wants to die out. I need to get this fixed asap and cheaply what should I do....
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