[MudderChuck]

There isn´t a vacumm modulator in the AW 4 that I know about.
I´d check power first, there is a 7.5 amp fuse in the fuse block, the 15 amp fuse behind the glove box and a fusible link, probably near the starter relay, behind the battery.
Next check would be the TPS, what is your input voltage, output voltage and how does your ground wire test for resistance? 4 pole connector at the TPS. Normal input voltage is around 4.65 or so, no matter what the book says. The output voltage should be around 3.85 but the tranny will work just fine up till about 4 volts or so. The check is made with the plug connected ( straight pin through the wire), the ignition on and using the 4 pole plug (TCU) ground, not a chassis ground to test.
A TV (transmission Valve) cable adjustment, might also cause problems. But with a miss adjusted cable, it will usually eventaully shift. or have really soft slipping shifts.

	Throttle position sensor A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the butterfly throttle valve. The sensor is usually a potentiometer and therefore provides a variable resistance dependent upon the position of the butterfly valve (and hence throttle position). The sensor signal is used by the Engine Control Unit (ECU) as an input to its control system. The ignition timing and fuel injection timing (and potentially other parameters) are altered depending upon the position of the throttle, and also depending on the rate of change of that position. For example, in fuel injected engines, in order to avoid stalling, extra fuel may be injected if the throttle is opened rapidly (mimicking the accelerator pump of carburetor systems).