Speed,
Just a thought but I accidentally plugged my modulator line in to a ported vacuum hole that was dribbling vacuum at idle(very low but tricked me) and mine did what yours is doing. ie.. only getting enough vacuum to shift at "ported rpms" ??
just a thought
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Dave Harvey
'85 Grand Prix
Chevelle Waiting
Just a thought but I accidentally plugged my modulator line in to a ported vacuum hole that was dribbling vacuum at idle(very low but tricked me) and mine did what yours is doing. ie.. only getting enough vacuum to shift at "ported rpms" ??
just a thought
------------------
Dave Harvey
'85 Grand Prix
Chevelle Waiting