But if you're seeing a missfire fault it's more likely coilpack as that's where the fault signal comes from... spark plugs didn;t show a fault on mine...
I think you are correct.
My missfire problems with my spark plugs have shown a cel but only when they are shot to pieces.
normally i just get the stuttering when trying to put the power down , but when they are nearly dead i do get the flashing cel , and if i carry on trying to put the power down i do get the full on cel
funnily enough i have only had 1 coil pack failure and that was a full on cel , thats not to say the other packs are not on their way out.