I think I'm having problems with my Idle Solenoid Valve.  According to
the archives, running a cold engine for a few seconds and disconnecting
the wiring harness to the ISV should reset the plunger opening the
passage between the vacuum lines.  Mine never moves.  It does
vibrate/hum and there is continuitity between the contacts.  I have
soaked the plunger end in carb cleaner for a couple of days and it
doesn't help.  Do I assume it is the ISV or do I need to look at the ECU
or idle stabilizer control relay?  If so, is there a quick fix until I
can order the part?

The bus runs great until it warms up, then it starts to buck and lose
power.  Is this related to the ISV or do I have another issue?

Thanks,
Darren.