Well, talked to the indy today and he said they took apart the air intake and the EGR valve. The intake was dirty and the EGR was full of soot. He´s going to give both a good clean and also change the oil and oil filter.

Hopefully that will fix the rought idle problem cause it´s gonna set me back another 400€ ... Don't know if I´m being taken for a ride here (in his defense the first 400 was my option to change the air filter and all 6 glowplugs instead of changing just the faulty one, from what I´ve been reading it just makes more sense)

I hope I didn't buy a lemon that I´m just gonna keep throwing money at...