I know this thread is old but there is a joint in chicago that will fill and drill. I wanted to put Mpars on my 240sx and I can't remember what they quoted but it was actually very reasonable. Gomez tires is the name of the place.
FYI I cleaned it when I replaced the intake boot to ICV hose using that writeup. Try unplugging it and see what happens. Wouldn't doubt if there are more vacuum leaks either.