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What is the spec for the gap on those plugs? Seems tight. They don't look flash - based on 1 plug. I think you need to pull them all - there could be worse ones. You are looking for a miss.
It pays to organise a simple way to pull the plugs. There is a Porsche tool that works pretty good. On the other hand I use a regular spark plug tool - but the socket extension kept separating when trying to withdraw the socket sometimes - hung on to the plug. So I welded part of a bolt to the plug - cut the shank so the bolt head just sticks out more or less flush with the heads. Drop a socket over it. Works great. If it was a few mm too long it would be tight to drop in some of the plug holes. Too short and sits inside the head and hard to extract. Trial and error sort of thing.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
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