I DID IT ! Well I never.
Got the expected Code 31 AND Code 12 which doesn't appear in the code lists BUTTTTTTT
I mentioned that I'd had ALL the cam gaskets changed...EVERYONE no matter how big or small.
Well ! I checked out the drivers side spark plugs tonight before it got dark. The front two plugs and holes were full of bloody oil..nearly an inch in each.
The rear one was dry as a bone. Didn't look at the passenger side but suspect oil may well be in some or all of those holes also. Guess what !!! She's going back to the mechanic.
Either the young lad who did the work didn't clean out the plug holes OR the new gaskets are leaking. Either way, not my problem. They need to sort it.
Although i cleaned out those that I could get at, she's still shuddering so either oil IS in the other bank or the plugs are flubbered.
Crazy !