YS 91FZ problems still

[Dean & Melissa Williams]

Hi 
This motor was running great at last after my idle problems thanks to you guys (fix them by sanding the rocker cover) was getting 9000 rpm top end and 2100 rpm bottom end with A 14x 10 with a20/20 this is a new engine. 
The plane has still not been in the air. 
the engine has had about 5l of fuel through it. 
The problem now is it starts runs up and tunes out to 9000rpm and runs for about 1 to 2 min. and then starts to surge and goes off tune with air bubbles in the fuel line from the regulator. 
Please help as I am from the outback of Australia and have no assistance out here. 

Thanking you 
Dean (outback OZ) 
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