I had something similar on my bmw 3 series 3.0 diesel a few years back. I used bmws software on my laptop to diagnose a misfire. Initially it said injector 5 not firing properly. So my first thought was faulty injector. I used the software more and dug deeper and got more info. The final message was resistance too high. When I checked the injection harness, the wires were all completely stiff. A new loom was only £45 so replaced it and it cured the problem and ran better than ever.
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