Even though the igniter is glowing, it can still be bad. The resistance has to be low enough for current to flow through the igniter to the gas valve, in order for the valve to open. You can check to see if there is a significant change in the current while the igniter is glowing if you have an ammeter. Just clamp the meter around one of the wires going to the igniter and watch for the change as the igniter heats up. Post your results.
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