What would cause vibration on a 2004 Oldsmobile alero at idle 2.2?

Vibration at idle in a 2004 Oldsmobile Alero with a 2.2-liter engine can be caused by several factors. Common issues include worn or damaged engine mounts, which can lead to excessive engine movement, or misfiring cylinders due to faulty spark plugs or ignition components. Other possibilities include an unbalanced or damaged harmonic balancer and issues with the exhaust system. It's advisable to conduct a thorough inspection to pinpoint the exact cause of the vibration.