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Well in that case air is getting in some how and its part of your problem(won't affect accel). Either way If you are going to start worrying about sensors O2 sensors are usually what kicks the bucket before anything else and they do induce rich run.
the increased vacuum created when you shut the throttle body to a lower opening induces greater temporary vacuum on your leak allowing more air than normal(at idle the engine is not turning over at 3K rpm and can't maintain the higher vacuum and at 3K rpm there is very little MAP vacuum so it won't influence it there(much)). Christ offered the test for this issue.
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