Hi all, Ok so been for a bit of a drive down to Dorset this weekend. about 20 miles before we arrive down there on friday the car started shuddering loads when accelerating at any speed. But there was no warning light appeared. Drove it home today and still doing it but again no warning light. Also noticed a severe increase in fuel consumption! (also used my torque app on my phone to read any warning codes and there was none) I serviced it a couple weeks back and this is the first real drive since then. After looking on here it could be the coil pack, however surely this would throw up a light??? Could it be a cracked spark plug? (had one before on my old vectra and had similar problems) Gona have a good look tomorrow, Any one got any ideas if nothing looks out of the ordinary???