High rpm after warm up

[vegaspilot91]

After the e30 warms up it idles high either at 2000 rpms or bounces between 1800-2200. Happens while pushing in the clutch during normal driving and at idle. Thought it was the ICV but that didn't solve it. Just replaced the crankshaft position sensor, icv, fuel pressure regulator, Coolant temp switch and sending unit, tps. Currently at a lost of what it could be. Any help

[dnguyen1963]

Vacuum leaks come to mind.

[packratbimmer]

Yep, vacuum leaks must be eradicated on our cars especially M10 cars and eta cars. Later cars have some adaptability, but vacuum leaks are common and should be addressed.

[UlrichFennec]

It's gonna be a vacuum leak, but do a smoke test to be sure. Went through this whole debacle a month ago.