Recently bought c30 from a Facebook user.. should have really known better !!

originally it was blowing black smoke when the turbo was engaged so I took it to the garage and it ended up having the turbo taken off for inspection. It ended up being sent away for cleaning and the smoke lessened for a few days but not full gone!

The garage said that it had been remapped.

I’ve got it back and it’s got more problems. After a bit of it drive it won’t restart until I’ve left if for a while, the black smoke and hiccups when I accelerate.

Any thoughts..???