I have had a "similar" problem with my E30, suddenly one day the idle dropped down to almost stalling (annoying vibration etc.). Opened the hood and one of the air vacuum hose was disconnected and it is too old to stay in place so ziptied it for now and waiting for a new one from my local garage so might be worth checking vacuum hoses for a leak
I have had a "similar" problem with my E30, suddenly one day the idle dropped down to almost stalling (annoying vibration etc.). Opened the hood and one of the air vacuum hose was disconnected and it is too old to stay in place so ziptied it for now and waiting for a new one from my local garage so might be worth checking vacuum hoses for a leak