Just a guess, but has the exhaust/muffler been checked? Mud Wasps just love to build their mud nests inside of them. Your machine won't run right if it can't expel the exhaust fast enough.
I took the carb off my string trimmer, cleaned it, new sparkplug and then I finally realized it sounded a bit more muffled than usual when it did sputter. Yup, mud wasp's had filled the exhaust port up. I could just poke it out with a stiff piece of wire on my machine. Listen to it when it does run and make sure it has a good bark/sound, a good clue to whether it might be an exhaust problem or not.
The repair shops must make a fortune fixing this problem...
Thanks for the suggestion, exhaust looks clean. Having been stung in the head by 2 or 3 wasps about a week ago I wasn't looking forward to finding more.
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