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Finally got home to my car late last night. I ordered the NGK spark plugs from Amazon arrived yesterday. I gapped the plus to 0.23", but since it was -10°C this morning with wind, I decided to have my fave indy do the deed. Took about an hour to get completed.
Results are excellent. No more stutter at WOT in high gears. I can feel better response immediately.
As for the factory maintenance plan plugs? Despite only 5k miles or so on them half of them were black and caked with carbon deposits. They looked like plugs had 50k on them not 5k... The gap on them were horrendous. One of them had a crooked ceramic insulator on electrodes. No wonder I was having problems.
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