DirtE30 - 1990 BMW 325i

[ViPER1313]

It sounds like the car is getting way more air than it should at idle. Does the car have an IAC? Maybe try cleaning that. I can’t think of any reason other than a massive vacuum leak / stuck throttle plate / IAC failure that the car would just rev to 5g without you being on the throttle, so I would check all of that first. Make sure the throttle is not sticking open.

Also, for shits and giggles, try starting the car using some or a lot of throttle. While cranking the motor, pump the throttle 0->100% 5 or 6 Times.