NO idle

[james accordino]

Looking for possible causes for no idle.  MC-2 engine.
 Runs well while running.  Starts fine first time, hot
or cold.  Throttle must be immediately applied and
modulated.  If throttle is released, car immediately
dies, hot or cold.  If it dies, 5-15 minutes til
restart.  No difference with ISV plugged in or not.
Swapped a clean, known working ISV, no difference.
Fuel pressure regulator shot,maybe?  Decel valve
stuck/sticking open?

TIA
Jim Accordino

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