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#14 sounds like a good test.
#15, silly as it sounds, is to make sure the line from the vac amp TO the trans isn't plugged. Once while patching that line I accidentally used a piece or hose that had a BB inside. Drove me nuts trying to diagnose it!
If you confirm a normal vacuum signal present at the transmission modulator, then the problem must be internal... either a bad modulator or something else inside. I'd try the modulator first, it looks fairly easy to R&R...
Good luck
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