My Dad, bought this suburban 10 years ago, loved and babied her like she was his first born. Today she's still as gorgeous but I can't get her to start and stay running. Need Help! I've changed the battery, oil and filter, drained the gas tank and refilled with premium, unstuck the calipers, but she just won't start. It was suggested that I change the spark plugs and wires, new fuel filter. But which of these do I do first, or at all? We have to sell. If you have suggestions please reach out!