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Good to hear it is sorted out. Sometimes it is the simple things that are a pain to find.

Throttle Position Sensor. It is what you have pictured. If it works when the vac is hooked to the modulator then I would check that steel line for plugs, pinches, or spots that have rusted or worn a hole on something. You could pull the line and blow a small amount of air though it and have...

He was talking about the shift valve on the injector pump not the vacuum pump. Moving it towards the firewall tells the tranny to shift sooner. The modulator is what the vacuum line goes into on the side of the transmission it is on the passenger side right under where the dipstick goes into the...

It will always shift hard at wide open throttle as the line pressure in the transmission is highest then. You might want to get an adjustable vacuum modulator and see if adjusting that helps.