Hey guys just a question I have a 1 series E87 123d, recently I had some issues with the EGR and DPF, the car was dying when I was in drive at traffic lights, I took it in and 4800$ later the mechanics replaced the egr solenoid and cleaned the dpf, when I got the car back it ran fine but had an engine light when I inspected i I found the vaccum line that leads into the egr valve was no connected, so I connected it which turned the engine light off, and it went fine for a few days and yesterday did the exact same thing just stutters and dies when I come to a stop in drive if I stop and put it in park then it's fine (still idles rough but doesn't die)
Does anyone know what this is or can anyone help me?