Weeeeell, if you must WVO, I suppose Elsbett is the way to go.

To check the EGR, just connect your mity-vac to the diaphragm and pump it up. When you quickly release the vacuum (yank the hose off), you should be able to hear the valve slam shut.

I just went out and disconnected the "stop" vacuum line. The car started and ran as normal. When switched off, it didn't stall but slowed to the mechanical baseline of about 550, as the electronic idle control was disabled. Reconnecting the "stop" line saw the lever immediately pulled all the way down and nearly instant stoppage of the mill.

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James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
www.engineeringworks.biz
1987 300SDL junker 170k
1982 300SD junker, 265k