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You sure you checked for all vacuum leaks, while engine is running, just spray brake cleaner around where you think there is a leak, idle will change when there is a leak, check everywhere, the smallest of leaks can hurt it. A lot of overlooked areas is the brake booster check valve located on the firewall, check all hoses that go to the brake booster, then get back to this thread. You have a vacuum leak due to you running rich and having poor idle, they go hand in hand.
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