My car is very slow to shutoff. I have already identified that the replacement ignition vac switch needs to be replaces (ignition broke internally recently). I hooked up the mighty vac to the nipple on the line and it was very slow to build pressure. Is this normal? As everyone else can probably say, I have broken the nipple and glued it back on several times, I wonder if it is plugged or this is normal behavior?

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42