The flame on my plumbed in natural gas BBQ "pulses".?

I have a Dacor 52" built in BBQ grill that came with the house I just purchased. The flame on the burners is low and also pulses. It barely starts and then the flame will fade away after about 10 seconds. The starter will reactivate and it will relight after a while. The flame is always low, however.

Your supply line is probably too small. It's very common to hook up a gas grill using tubing rather than carbon steel pipe. But if you look in your house, you probably have 1 inch pipe or larger from the gas meter to the gas furnace and stove. Normal household pressure is not measured in pounds, but rather in ounces of pressure. Too small a diameter or too long a run of tubing will drop the pressure way down.

You may be able to get around this, by replacing the gas burner and the valves on the grill to run on a lower pressure supply.