I'm not Tremendous acquainted with the ITBs, so I can't recall within the setups I've observed if Each individual throttle features a vacuum reference line or anything equivalent? If All those usually are not linked you might have some good vacuum leaks. I have to examine my dual carbs From https://4age-engine-sale69369.slypage.com/33064429/the-best-side-of-4age-blacktop-engine-for-sale