I had a similar problem. My broiler wouldn't light but the igniter was glowing. It turns out this igniter has to glow virtually white hot. If it's red or orange it probably needs replacing. I bought a new one from Appliance Parts Pro's. However, when I look at pictures of these things they all look exactly the same. My guess is all appliance manufacturers use the same unit.

To change it on the Dacor you need to pull off the back panel. Loosen the unit inside by removing the screws and shake the wires so someone else can see which ones. Disconnect the wires from the connectors and tape a piece of thickish string to it. This allows you to pull it out from inside the oven and have a way to get it back in past all the little turns and corners. My replacement had bare ends so I cut off the old connectors and soldered them to the new unit. However, I would guess you could use wire nuts instead.