Hi All,
does anyone have an explanation for why Benz diesels tend to idle rough at stops, when hot?

I'm sure many of you have noticed your oil pressure dropping at stops, which can freak out many new drivers who aren't used to it.

My 190D 2.2L (om601 engine) has always idled poorly at stops when hot, and it has gotten worse to the point that I sometimes think she might stall. I've tightened up the throttle cable a little, which has helped.

She is well-maintained at 240K miles, with rebuilt injectors and a cooling system that is performing well (to the best of my knowledge). Temp gauge recently stopped working :-(

Can anyone explain why diesels behave this way when hot?

Thanks!