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Take it out, and power it up by applying 12V across the two pins-- it should open completely with little delay. When you remove the voltage it should close quickly too. While it is powered open you can clean it out well with carb cleaner and Q-tips.
I have made a tool for cleaning these valves using a piece of the wiring harness of a junker with the appropriate connector and a length of wire with alligator clips to attach to the car battery. That way I can clean the valve very thoroughly.
Good luck!
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