Why would a 1990 Buick Century turn over but not continue running we have added fuel injector cleaner?

If your 1990 Buick Century turns over but won’t continue running despite adding fuel injector cleaner, it could be due to several issues. Common problems include a faulty fuel pump, clogged fuel filter, or issues with the ignition system, such as bad spark plugs or a failing ignition coil. Additionally, if the engine is not getting enough air due to a dirty air filter or a malfunctioning mass airflow sensor, it may struggle to continue running. It's also worth checking for any diagnostic trouble codes that could provide further insight into the problem.