Surging When Hot - Replaced Carb, Plug, Coil, Air Filter - Video & Pictures

Hi Folks.

So when my Lawnboy model #10627 gets hot it starts surging. Here is a video of it.

http://ift.tt/1UX1Dg2

Here are some pictures of it.




I have replaced the carburator, have good fuel, and good fuel flow.

I have replaced the coil and plug and air filter.

I have tried running it with the gas cap very loose (so no vacuum).

Suggestions? Could it be a auto choke?

Thanks for your advice.

Surging When Hot - Replaced Carb, Plug, Coil, Air Filter - Video & Pictures