Any one try these
05-17-2006, 07:23 PM
#2
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Join Date: Nov 2001
Location: Ontario Calif.
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I tried a set on the 4.8L in my Silverado. Seemed to add about 1 or 2 mpg but then at 10k on them 1 started causing a misfire. I took them out and put the stockers back in.