Ok. So I'm reading about testing the transmission modulator. Jack up the car and all that jazz.

Here's the question. When I pump down the vacuum line (black goes down to trans just behind air filter) I get it holding a steady vacuum. Soooooo... what else is there for me to "test" in this department. Is there a reason that they say to disconnect the line and test the modulator right @ the trans? What am I missing?

Thanks again, Pete