Hello all. I have a Polaris 90 Sportsman that was given to me that will not stay running. I have taken the entire carburetor apart and thoroughly cleaned to make sure there were no clogs. If I spray starter fluid into the carb from the intake side it will run briefly then die out like it is not getting any fuel. I have pulled carburetor fuel line loose and verified it has good fuel flow from selector switch and also verified that it is getting fuel to the bowl as well. Is it possible that I have a vacuum issue? I also verified i had good spark and motor compression of 105. Any advice would be greatly appreciated as my son is nagging me constantly to ride it.