My usually reliable Terrano is giving some grief, lately it has been a bit spluttery at low revs, just the odd hiccup now and then, but today it has been playing up terribly, it cit out a a junction and ran like a dog when restarted, until it hit 2000 revs and pulled away as normal, I was worried it was fuel starvation, but on the motorway it sat at a very comfortable 80 until the end of the motorway when it started the stutter thing again, when it stutters there is a burst of blue smoke, keep it above 2k and it is fine.

Stumped here because it has a FSH and it's been boringly reliable for the 8 or so years it's been in the family.