With regard to ""stuck closed", in my auto tech career the only times I came across a stuck closed throttle plate is when (this goes way back) idle rpms were controlled by electric throttle stops. If the mechanical idle screw was backed off, the throttle plates would seize in the throttle bore when the engine was turned off (power now removed from the electric throttle stop) and as engine temperature cooled the throttle plates would lock up in the bore, which is why you always want to ensure that the throttle plates are cracked open at least a little bit. Say you had a vacuum leak causing the idle rpm to increase and you backed off the idle screw to reduce rpm - if that idle stop is backed off too far after the engine cools down you could experience the "stuck closed" condition.
Did you get your problem solved. I am experiencing same slow speed. Went from 40 to 15 mph.
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