Ken,
Depending on the exact model there is a vacuum line that runs from the intake manifold to a valve on the side of the transmission. If the line is cracked or has come off you will have wonky shifting. I would start there. I have replaced most of my vacuum lines, but I have fewer lines than you do.
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Brett G
WBCCI #5501 AIR # 49
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1978 Argosy 28 foot Motorhome
Wise men talk because they have something to say; fools, because they have to say something. -- Plato
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