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Changed plugs today. About five hours 7 broke. Changed 1 COP. Is it just me but it seams like she runs 100% better. Looking forward to see if my MPG gets much better. Had a miss on #6 thats where the COP went.
Did you follow the TSB ?? Seems like a lot of breakage if you followed the instructions with that mileage. Sorry for the sarcasm....just had a senior moment.......Good !!, miserable job well done !!