What causes a 1997 Olds 6 cylinder rpm to fluctuate when it warms up?

Fluctuating RPM in a 1997 Olds with a six-cylinder engine as it warms up can be caused by several factors. Common issues include a vacuum leak, which can disrupt air-fuel mixture, or a malfunctioning idle air control valve (IAC), affecting idle stability. Additionally, problems with the fuel system, such as a failing fuel pump or clogged fuel filter, or issues with the ignition system, like worn spark plugs or ignition coils, can also contribute to RPM fluctuations. It's advisable to diagnose the vehicle using an OBD-II scanner for error codes to pinpoint the exact cause.