Th350 shifting up and down repeatedly on hills.

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ELCAM

Royal Smart Person
Jun 19, 2021
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All that matters is it is not closed. So theoretically no exhaust restriction.

Problem is when the transmission sees 3 inches of vacuum it thinks you have the throttle wide open and it wants to downshift.

Other things that affect the vacuum would be cam, cam timing and ignition timing. Is all that stock?
 

GBodyVillain

Not-quite-so-new-guy
Jan 4, 2021
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Yeah the cam and ignition is all stock. and that makes some sense. To avoid it downshifting a bunch I let off the throttle a bit.
 

78Delta88

Royal Smart Person
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May 23, 2022
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It's a TBI
I concur with ELCAM, no way the manifold vacuum should be that low at 2000 rpm. And then with the spaghetti bowl of vacuum lines you describe, once that gets figured out I'm sure you will be on your way to a much happier drive.
 
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