Husqvarna 455 bog issue

[Gameon07]

I think many people have had this problem, they've managed to fix it by replacing the purge bulb or replacing spark plug fuel line, fuel filter, I've done all the above and even replace the carburetor, still the saw will not rev up. I think I might have narrowed it down to the manifold gasket. Any Advance tecks with experience with this issue, could this be a possibility? Thanks.