The EGR doesn't have vacuum at idle so that seems to be ok. I'm not sure what you mean on the second part but there is a passage through the IAB with a valve in it.
Make sure timing is correct, adjust idle with the IAB disconnected, set the TPS. If this doesn't work you could have a vacuum leak. Have you checked for codes?
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'89 GT work in progress
'66 289 coupe even more work
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