I have a 96 shee with pro circuit pipes, pro design filter, boyesen rad valves, running stock carbs with 360 mains, 30 pilots, needle clip 1 position higher, no snorkel, two 1 inch square holes cut in the top of the air box lid, no tors. It wants to cut out at high rpms. I live in northwest ohio, so there is not an elevation issue. I tried adjusting the air screw , no luck. then I took off the air lid and it ran great. Is this the right fix or do i need to try something else.