What would make a 1985 Oldsmobile calais surge at an idle and lack power?

A 1985 Oldsmobile Calais surging at idle and lacking power could be caused by several issues, including a vacuum leak, which disrupts the air-fuel mixture, or problems with the fuel system, such as a clogged fuel filter or failing fuel pump. Additionally, ignition system issues like worn spark plugs or a malfunctioning ignition coil can lead to poor engine performance. Finally, a malfunctioning throttle position sensor or issues with the idle air control valve could also contribute to these symptoms.