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Clean the spark plug, or put a new one and see if that improves the spark. (double check on other cylinders as well)
Sounds like a weak spark, could be caused by a heavy fouled spark plug as Purplebeeper mentions.
Other causes are poor plug wires (should not go all together though), faulty coil, poor ground to name a few.
Let us know some more details indeed what engine, coil, distributor, etc.
383. updated ignition no points fairly new wires & cap & rotor. Brand new plugs. 13 volts at the battery less at the ballast resistor. Dim spark on two plugs. Weak orange spark. It doesn't even try to start. Thanks Ray