[NorthantsPete]

To recap observations:

i) First happened - after i did 350 miles when I got the car (tesco fuel) and filled up with shell v-power as a nice cleanup and who knows if it ever had any previously.
ii) Happens after constant speed ie. cruise control
iii) Happens during use of a cleaner ie. vpower if never used, or additive.
iv) Cleared by pulling over, turning off engine, then driving spiritedly.
v) Cleared using ar6400 after first using another cleaner and getting
the symptoms - problem wen away for 1.5 months
vi) Happens when car hits last 5th of the tank
vii) Usually happens after a long run (first time was 350 miles, added vpower then problems started, next was 200 miles home and happened when using toolstation and got to last 1/5 of tank next day on way to work (not during the big run).
viii)no consistency of fuel used, some unknown, some tesco crap.


Im now trying to keep things constant either do a month of no additives, a month of premium and comparing - starting with premium to eliminate the 'engine build up and clean' issue i think is related