Just thought I would follow up on what solved the problem. I checked the fuel and exhaust lines for blockage and found none. So I leaned the idle mixture and re-tuned and that ended up solving the problem. I ended up turning the idle mixture screw in about 3/4 to 1 full turn, which surprised me that it was that far out of tune. I am getting 11,900 max rpm and it idles at 2,600 rpm with a 12x3.75 apc prop on 10% nitro. It will idle endlessly and then rev up without hesitation now. Thanks to all for the help I got to fix this.