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Power steering belt let go. Is the alternator light on. Usually more than one accessory is driven by the belt, like th water pump, air conditioner. Open the hood and have a look with a flashlight.
Manual transmission? Clutch or parking brake or both. You should always use the parking brake for this reason. If it is manual you need a new clutch. The disc is too thin now to clamp hard. Automatic, Some problem with the parking pawl or the shifter.
You probably forgot to install the air temp sensor which is usually located in the stuff you remove. Find out what the code is from some parts store and then you'll know what you are looking for. Whatever sensor is in the removed stuff needs a home in the new setup and to be plugged in
The park module may have some wire connections that are cracked. It is a common problem and if you know how to use a soldering iron, one you can maybe cure yourself.