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Howdy, Does that tranny have a modulator on the side the vacuum line goes to? I'm not real familiar with the slim-jim if it has that funky convertor. I had the same problem with a '68 Pontiac and it was just a bad modulator, could also be the line itself as mentioned, low tranny fluid or dirty filter, may make a difference if the vac line goes to full manifold vacuum or ported vacuum.
Just my 2 cents woof,
Allan
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