I have just removed what I believe to be original identical spark plugs from my (new to me, used) 2005 4.6 liter Mercedes. Grand Marquis (like Ford Crown Vic, Lincoln Town Car). No traffic jam records were recorded and idling became a little rough. Among the items that required attention were curly plugs. It's a steal at $3 for a platinum fork. In comparison, my 6.4L Challenger Hemi requires 16 plugs (2 per cylinder, 8 cylinder car) and those plugs cost about $15 each. In any case, the adaptation to 4.6L does not require much skill, but it does require a lot of patience and an extensive set of heads with knees, extensions and many adjustments. Schedule a 4 hour job if you're not an expert and watch some tips videos. I just completed it and took it for a test drive and it purrs like new, no more rough idle. You'll feel pretty good about maintenance that will last another 90,000 miles (recommended spark plug change period). These forks are fantastic and a bargain price. I'm buying another set to put in a box with extra parts.
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