Hi i have a 307hdi 136bhp just been to cornwall in it and done about 1500 mls in it and i have noticed when you first start it up in the morning it chucks out lots of black smoke and runs really rough,but after a couple of mins it clears its self!!! but hesitate's quite bad gets better when warmed up??And when you put your foot down it also chucks out lots of black smoke my back bumper is covered in it!Can someone please help and give me some idea's!!!! and its got poor fuel consumption??