Smokey jtd at low revs
My 147 1.9 jtd with 165000 miles has recently got a little more smokey to the point where mscf light came on today ( havnt read code but was playing with throttle to see what made it smoke when it came on.). In the 25k or so I have owned it its always felt a little hesitant at low revs may have got worse over time but hard to tell, with a steady throttle you get small changes in the power delivery. It has now started giving out a decent quantity of black smoke when on part throttle at low revs (but not always). All seems ok if you boot it.
I am thinking MAF or EGR