[Joe H]

So I need some education again.....
Our V70 1999 2.4 non-turbo started a major misfire. One moment fine, the next hiccuping shaking and very rough running at all revs.
The AA decided it needed all 5 coil packs replaced but could only get a single one from the local motor factors so swapped that into each plug in turn without it making much difference.

Back home I put it on VIDA which shows ECM3503 and ECM3502 misfire on Cyl 1 and 2. The misfire count is the same on both if that means anything. It is the same with hot or cold engine
So far I have dug out tools I haven't used since the days of carburettors and:
-Done a compression test (consistent across all cylinders)
-Swapped injectors around. The misfire stayed with 1 and 2.
-Checked spark with a tester that shows the spark jumping a large gap on all cylinders.
-Swapped plugs and also later put in an old set. No difference.
-Swapped coil packs. Engine seemed to get a lot more rough with some swaps but VIDA still reported just 1 and 2
-Removed the wiring harness covering under the cam cover. All looks healthy
-Checked coil pack earths on cam cover, all looks OK.

So......what do I do next??? I'm not forgetting that the AA guy wanted to replace all coil packs but as they are all giving a healthy spark that doesn't seem right. Or can they be breaking down in some other way?
Joe