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According to the -34P the GM number is 359917
You should be able to get them from GM or any parts house as Burbn said, it's a very common part.
Later,
Joe
TM 9-2320-289-20 Section 3-21.1 Page 3-64 (Page 197 in the PDF) covers the VRV replacement and adjustment.
TM 9-2320-289-34 Section 5-3 Page 5-6 (Page 366 in the PDF) covers the modulator valve replacement.
Later,
Joe
He said he replaced the modulator, vacuum lines and the pump in his OP but I agree, check those things first before dumping ~$100 on a valve.
Also, forgot to mention that you should check to make sure the lines are hooked up properly at the VRV, the lower line is the one that goes to the pump...
Sounds like your Vacuum Regulator Valve is not adjusted properly or is not working. It's on the passenger's side of the injection pump.
To test, put a vacuum source on the lower port of the VRV and a gauge on the upper. With the throttle open to nearly WOT you should have 8 in/hg at the upper...
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