Damn servicing mechanic!
I will just have to remind my local garage (who are normally very good), that when they replace the spark plugs they need to pinch up the thread at the top of each plug.
Started ok, but ran lumpy (sounded like running on six or seven cylinders) during warm up on LPG especially, then when hot ran fine.
All sodding eight spark plugs had the top thread loose (where you push on the HT Leads), quick nip up with a pair of thin nose and not running lumpy during warm up anymore.
Jeez, why do they do this to us, I was having palputations over the possibility of something expensive going wrong...again!
Before you all admonish me for not servicing it myself, I am disabled.