I am using a APC 16-8 prop.

A guy at the local hobby shop said its got to be the fuel pick up line being to far back. I can hold the plane nose down and the engine will run wide open for quite a while before it runs out of fuel. I would say this is not the problem.

He also mentioned it could be too lean. I will adjust the mixture again tonight, but I have tried it running rich, so rich it was quite low on hp. Same thing.