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Laguna V6 misfire - kiwi II
I've got a misfire in a '96 laguna v6 - it is intermittent and when it happens it is usually at low throttle pressure and goes away at about 3000rpm. sometimes it's so bad it'll not get to 3000 rpm! it happens for maybe 10-15 minutes (car is hot or cold doesn't seem to matter) and then it'll be fine for a few weeks/months. Renault London reckoned that it was a split vaccuum pipe confusing the Engine management but the problem is still happening after a new pipe. renault Auckland (Yes,the car has moved from London to Auckland!) reckoned it was the coils, but 3 coils later and it's still happening. Any ideas?

PS. I was the kiwi asking about the heater matrix but have moved from the Uk to Auckland NZ.