I think you should have the FR -- R --- is for none risistor spark plugs . You need to check it first though .It could well be the problem . Stick the old plugs back in to see if i am right .. Let us know please ..
And if sticker is illegible, look on the bottom surface for a date in the casting. It will be in a small circle in one corner.
The date may predate the ETA, but it is a good second check.
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