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No one said anything about getting an adjustable vacuum pump. His original post said he adjusted something between the firewall and the air cleaner... that was likely the vacuum pump which I was letting him know did not do anything to help the situation.
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 transmission. To adjust it you need to remove the hose into it and there is a set screw looking thing in the nipple move it out for smoother and earlier shift and in for harder later shifts. It is not as dramatic of a change as adjusting the valve on the injector pump but it may help. Also if there is no set screw in the nipple of the modulator (as the stock one was not adjustable) you can pick up an adjustable one for less than $20 and it is one bolt to replace.
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 someone on the other side see if he can put his finger on it and feel pressure build up cause if it is leaking then pressure cant build or if air doesn't go through it is plugged.
