I took the car out yesterday and drove 20 miles no problem. I then stopped to pick something up at the shop started it drove around 600 yards and pulled up at a set of traffic lights. The engine sounded like it wasn't firing on all 6 and there was a lot of vibration through the car. A quick rev to 1500 and it was running smooth again. I continued then for about another 30 miles no problems. Later on used it and everytime it comes to a stop and it is left to idle the car shakes and the exhaust is note is thumping. The engine note sounds slightly metalic. Pleae note this is not a DPF regeneration as I know how that feels.
Any suggestions before Vauxhall opens on Tuesday would be appreciated.