I rejetting my carburetor and it ran good but it was popping back through carb when cold. I read about putting two # 4 washers on the slide needle. I completed installiing them and now it doesn't pop when cold and idles great, , but I have lost power past half throttle. It somewhat boggs and doesn't reach rpms. I pinched the gasket that fits around the slide but not sure if it has a tear or hole. Is the washers causing the loss of power, or would a hole in the gasket cause this?? Any help appreciated..