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They call them spacers but they are mini cats. this means the oxygen sensor sees less oxygen, and leans the mixture.
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The plugs are Autolite Iridium. I will probably replace the #5 plug because it was fouled the worst.
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1991 Chevrolet K1500, 4.3 V6. Plugs only have a few hundred miles on them but are Fowler. Two reasons, it’s t it burns oil due to bad...
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I used to use PUP for my 2006/2007 Odyssey's about 5 to 10 years ago.
I stopped using it when I realized the VOA's showed it was on the...