Furnace acting weird

Hi. Anybody know anything about furnaces? I installed a Goodman furnace I ordered online with my dad. It is two stage and when I turn it up in the morning from 60 to 68 it slows down for a while at 66. Also once in a while when it turns on it stops after the first try to start and starts a second time and then keeps running. I might have some dip switch settings wrong. Maybe my cold air return is undersized. I haven’t called a furnace guy yet.

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