1989 Oldsmobile Delta 88 Won't start when cold outside.

My Olds Delta 88 Royale doesn't want to start in the morning when it is cold outside. If it warms up enough, it will start fine. My brother in law said it's getting compression and fuel, but not spark. He thinks it is the ignition module but I would like to be sure before spending that much money on that old of a car.