Before you change the plugs I'd try the closed choke and try to pull any dirt out, won't hurt the plugs at this point, better than running the new plugs rich.
Have you checked the float for gas inside if it's a brass float? It just takes a tiny crack or pin hole to let a little gas get inside and make it heavy enough to not shut the needle off completely.
Fuel pressure test?
Known good coil and wires, especially coil wire?
__________________
Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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