CAN ANYONE HELP IVE JUST RETURNED FROM A 1000 MILE ROUND TRIPIN MY 2001 TD4 AND IT HAS STARTED TO BELLOW BLACK SMOKE FROM THE EXHAUST AND A SLIGHT LOSS OF POWER AT THE SAME TIME THIS ONLT HAPPENS NOW AND BUT IS GETTING MORE FREQUENT CAN I TRY SOME SIMPLE FIX,S FIRST OR IS IT A JOB FOR THE GARAGE ,CHEERS