Erratic RPMs, 1995 BMW 318is
Hello there, there are a few possible causes for your 1995 BMW 318is to have a fluctuation in the RPM's. The most common are a vacuum leak (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-vacuum-leak), oxygen sensor (https://www.yourmechanic.com/services/oxygen-sensor-replacement), throttle sensor (https://www.yourmechanic.com/services/throttle-position-sensor-replacement), exhaust leak (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-an-exhaust-leak), or the fuel...