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I had a 98 s-10 (2.2L)for my first truck, I put Bosch +4 in expecting great gains and couldn't even do a burnout on grass (i was 16) and my cat was glowing red hot! I was told to put the OE Ac delco plugs in it, I did and went on a trip to Kentucky and back got 27 mpg with an automatic trans and the truck ran great! My vote is the OE Plug maybe a little wider gap
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