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Do you have 120 vac to the igniter just before/while the gas valve is open?
You need a meter to confirm the likely culprit here. The only other thing you can do (without a meter) is to check your connections to the igniter, at the board (disconnect and reconnect)and where it plugs in to the igniter. If it's not a bad connection then the likely culprit is a bad board and I wouldn't spring for a new board without checking the voltage first
Generally a few hundred more or less
It's marginal. You can expect to get 20 years out of a furnace. Beyond that it's usually on borrowed time and the repair bills will mount as the years progress. If it won't break the budget you might want to get some estimates for a new furnace then decide
Yes, if you're sure the gas valve is opening. Sequence is: draft fan runs> draft pressure switch proves adequate draft> ignitor glows >gas valve opens.