Good Grief.
I am going nuts trying to figure this one out.
My mityvac tells me there are leaks throughout my vacuum system. I replaced the IP shutoff, and blocked every other line in the engine compartment.
I connected the tranny line directly to the main vacuum, still unreasonable hard shift.
So I decided to include the 3/2 way on the valve cover, and the vacuum modulating valve on the IP.

Can anyone tell me what the line on the side that I have plugged on the vacuum modulating valve is? The diagram says "vent"
- the other top line goes to a 3-way, this side one went to a pod on the left side of the counsel.
Should I just leave it open or plugged? (see pic)

This may all seem confusing because I don't know what the heck all that stuff is for. Why do they make it so confusing?
Is there a simple way to just plumb only the tranny?
I have read forum after forum, and it still is a mystery...
This being that wonderful year, 1980, no turbo, no functioning alda..

If anyone could help me, I would be forever in your debt.

I called the repair shops, but at $95 an hour, with all my vacuum problems, I would get seriously spanked. I just can't afford it.

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Think Alternative Energy!
300CD '80 (now gone but not forgotten...)