Need advice! Engine sputters!

[wittsend]

A friend offered me his 13hp yardman for $60, it was a steal so I had to get it. he used it one summer, let it sit during the winter and, as usual, it didn't start the next year. It sat for two years total. I took the carb off and cleaned it and it ran but it wouldn't stop sputtering.

Since then here's what I've done to try to get it to run smoothly:
cleaned carb 3 times, using carb cleaner and compressed air
installed carb overhaul kit from Briggs and Stratton (new seals and needle valve)
flushed gas tank and put in new gas
used fuel treatment
replaced fuel line and filter
replaced spark plug
changed oil
cleaned air filter

despite all this my mower still runs like this: http://youtu.be/KLReZdNsGoM

What else can I do? I did notice that if I restrict air flow at full throttle it does run a little better, but not like it should.
Should I just sell it and let someone else deal with it? I would rather not as I have put this much time, energy and money into it...

Any advice would be great!

Thanks!

 

[mechanic mark]

Small Engine Problems Troubleshooting and Repair | Briggs & Stratton FAQ

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[Mikel1]

What are your engine #'s?

 

[wittsend]

What are your engine #'s?

Model: 219807
Type: 2695b1
Code: 091029ZA

 

[Mikel1]

Did you take out the idle mixture needle(cap on it) when you cleaned carb? I take it you have already tried adjusting carb?

 

[wittsend]

Did you take out the idle mixture needle(cap on it) when you cleaned carb? I take it you have already tried adjusting carb?

I did not take the ideal mixture needle out. I just thoroughly sprayed every hole and jet with carb cleaner and compressed air. Would that needle also affect the engine at full throttle? Could it be an ignition issue if not?