E34 535i slightly lumpy oscillating idle

[Bogracer]

Project 535i is underway. Big inspection 2 service done, fresh plugs, filters etc and no fault codes. On idle is feels a little lumpy and 'oscillates'. I have been told this could be grubby throttle bodies?

Pearls of wisdom greatly appreciated!

[dumphus65]

Ive just had problem with thermostat, and during my enquiries lol i was told that my "hunting" was also due to thermostat sticking.change your stat and see if that stops your "lumpy running"

[Bogracer]

Makes sense as the temp gauge never gets above 1/4. Cheers fella.

[roofer]

As above, if it doesn't get up to temp the cold start system gets confused. Idle control valves always benefit from a clean as well.