hi... I've been having a serious problem with my stilo… on Christmas day it started juddering violently when idle... now I've changed all sparks and the offending coil of cylinder 2... all other cylinders seem fine and no.2 is firing, but not actually doing anything, the car seems fine when throttle is down and on the move. error codes coming up are P0300 & P0302. air intake is fine and all connecting pipes are also fine. i'm at a total loss, and don't want to drive it till it's sorted!:bang: