What could cause a 1999 saturn sl to run rough and hesitate?

A 1999 Saturn SL could run rough and hesitate due to several potential issues, including a faulty ignition system (such as bad spark plugs or ignition coils), a clogged fuel filter, or problems with the fuel injectors. Additionally, issues with the air intake system, such as a dirty mass air flow sensor or vacuum leaks, could also contribute to poor engine performance. Lastly, engine-related problems like a failing EGR valve or low compression in one or more cylinders could be factors as well. Regular maintenance and diagnostics are essential to pinpoint the exact cause.