Mercedes 190e hunting, rough idle, almost stalling. Help required please! 

Check for air leak in the brake booster.

@@davekostanich8770 Thanks for the tip, I think the issue was a bad fuel pump relay

I'm a member of one of the group's on Facebook and another HTML forum

Did you solved it?

@@asineprestanou5221 Unfortunately I still haven't figured it out.

@@enesgok9340 maybe i just find out the solution. My car wasnt able to start, i bought new temp sensor and now i find out, that the new is faulty too. It leans the mixture and thats cause the engine hunting. Try to unplug the eha, if it is okay, you probably have the same issue. Previous temp sensor was good, but eha was setted bad (no differential pressure) so its enrichtment cause engine stalls. New one have at 3 celsius only 1 kOhm resistance, and thats very low and bad. Hope that you can solve it now

@@asineprestanou5221 Thank you for your advice. 🙏

I have done a lot of work on the injection system, I think the issue was a bad fuel pump relay

@@chrismartin_101 I have the same problem, only cold, did you solve it? what was it?

I am interested of this problem

Did dou solved it?