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  1. R

    Half plugs fouled, half plugs worn center electrode!

    I foolishly didn't look for which cylinders the plugs came out of. But they had 92k on them, so ready to swap. I ended up buying Bosch +4 Platinum plugs. Not sure why. Hope they're ok. Still have to sort out the slow idle issue.
  2. R

    Half plugs fouled, half plugs worn center electrode!

    Hello, New here! I replaced the plugs in my '04 Explorer XLT 4.0L with 92k miles - and I replaced the wires too (not so easy). I am giving the car to my niece, and it was idling a little rough and slow. Runs fine at speed and starts ok (better with new plugs), but still idles rough and...
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