What should happen when the ISV is disconnected?

[Mike Robinson]

Hi all,
I am in the midst of solving an intermittent stumbling idle problem on my 89
MC-1 200q.  The car idles normally when started cold, but I often have to
heel-toe it at stops to keep the idle from dipping and sometimes the car
stalling.  This does not always happen, and usually after giving it a little
gas for a while the car while idle normally.  I have not checked for any
leaks in the PCV hoses or in the intake yet.  The car drives wonderfully
otherwise.  When I disconnected the ISV wiring, the car died immediately.
Is it supposed to do this?  I recall hearing other listers say their cars
would idle higher with the switch disconnected.  Could the valve be sticky
or stuck closed?  Any insight would be appreciated.

Mike Robinson
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88 90q
89 200q MC-1