Any suggestions what to check my 06 freelander 1 is smoking bad mainly black smoke which is occasionally blue to the point you can't see behind you and constantly surrounded by a cloud of smoke. Happens all the time not really worse under load or when cold etc. it's running rough and sounds rough sounds like it's missing and the car seems to judder when parked up. I wouldn't say it's lacking in power though maybe slightly in the lower gears. Any suggestions what to check or what your first thought would be?