X2. A spark problem is highly unlikely but possible. If you pull the coil wire off the cap and crank the engine, Do you get a good blue spark that will jump a 1/2" gap? If so, you can forget about a spark problem unless your wires have gobs of resistance in them. If the plugs were bad, you'd get a miss. I would bet on the accelerator pump, choke, fuel percolation/drainback, or a combination of the three.