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Originally Posted by HaRRaSSeR
I replaced...spark plugs with Bosch platniums that are pregapped.
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There is part of your problem. Those plugs suck. Take it from me. I used them for about 500 miles before I switched back to my NGK plats.
I would suggest taking those out and putting in some NGK coppers instead.
How fouled were your original plugs? Perhaps the reason it's still running the same is because those Bosch plugs are performing just like your old fouled ones
EDIT: also, those plugs are not properly pregapped. When I got mine they were off by about .008