How do you set the timing on a 1980 Plymouth Horizon?

To set the timing on a 1980 Plymouth Horizon, first ensure the engine is at operating temperature and then turn it off. Locate the timing marks on the crankshaft pulley and the timing cover. Use a timing light connected to the number one cylinder spark plug wire and aim it at the timing marks while the engine is running. Adjust the distributor until the timing mark aligns with the specified degree for your engine, which can typically be found in the vehicle's service manual.