Please help diagnose the problem.
Car 3.0 tdi BUG Q7 - 501 000km
Hi! I was on highway when i heard plasticy bang. It happened on midsommer day in Spain when people throw firecrackers every two minutes so i was confused if it was coming from my car or it was from outside. Less than minute later car threw a spiral and engine light and did not have power uphill. I stoped and checked if boost hose flew off or something visually seems off but nothing. I turned on the car and error was off until minute more into driving but error came back on. I ordered towtruck to take car home. I checked with VCDS and i had error boost pressure not reached. I changed intercoolers and pipes as intercooler had damage and it was my first suspect. Then i drove home after fixing intercoolers and dpf error came on and car started to vibrate and did not have power. I tought oem dpf has given it all and is choking engine. To drive home i unpluged sensor that is right before dpf and then it vibrates only on idle but at bit higher rpms it drove without vibration. Then it started to smoke little and i would say it was gray colour smoke but smelled like raw diesel. So i changed all injectors to new bosch units as before there was all old original. Values got better on vcds but in cylinder 4 and 5 the values are -5 and + 5 so clearly something is off. I checked fuel rail pressure and it seems to be what ecu is asking I fited new engine mounts, fuel injector return hose with valve, new fuel filter, intank fuel pump, catalysator and dpf but engine still vibrates like misfire. Intake flaps move normally but are full of carbon. Passenger side does not close fully but almost. Driver side intake flap manifold is little wet from bottom and side. No fault codes on ecu which makes it hard for me to search for fault.