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Sounds a little like rings. If they are bad enough oil getting into the intake past the rings could be sludging up the intake and jamming the tvis. And with the oil being down it sounds like it is burning oil. Do a leakdown and if inconclusive try a compression test. When my rings went in old 4age went it was all smooth but the intake sludged up. Same with my 4agze. They did it especially under wide open throttle when the oil pressure was up and oil was getting thrown up into the rings.
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