Hi I am relatively new to freelander ownership only had it a few months its a 53 reg td4. This week it has developed a problem, Its very sluggish and very sluggish to the extent that the slightest slope it drops to about 15mph and does not want to do much over 40 or 50 on the flat and takes ages to get there. and the smoke is that bad you cant really see out the back window. Any ideas please.