There's something called the injection pump vacuum valve on FastLane (and it asks for your trans. # so I guess that might be it) listed for $148. I guess that's an awful lot to spend on something that I don't even know is broken. How would I go about testing this valve to determine if it's bad? Thanks.

Alex

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1983 300D (parked for four years)
2012 VW Sportwagen TDI Manual
2001 Miata SE
1962 Chevrolet Corvair Rampside