I have not mentioned that I had been ripped off before by two garages who seems not worthy of my money so I decided to fix the car myself and I am getting there.
First, oil leak due to the upper chain pins not sealed; he said it was the crankshaft oil seal...£135!
Second, supposed to be a FI specialist; unstable idle he said faulty aux air valve...wrong! Cost £35 used part!

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'92 190E 1.8