When I started it revs up really high RPM's?

When you start your vehicle and it revs up to high RPMs, it could be due to several factors, such as a cold engine needing to warm up or an issue with the idle control system. This behavior is normal for some cars, particularly in colder weather, as they may automatically increase RPMs to help the engine reach optimal operating temperature. However, if the high RPMs persist or seem abnormal, it may be wise to check for potential mechanical issues or consult a mechanic.