There's a strong possibility that your problem is it sat for so long, and the seals being hard. But, your shift problem sounds much like a bad modulator, wrong modulator or a vacuum problem. I would check that area first.
Drive it some, maybe you'll get lucky and the seals will supple up some.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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