Title: No good for my Hummer H2
Product review: Had my mechanic put these plugs in my 2003 Hummer H2 with 102K miles on it. As soon as I drove off the truck felt very sluggish and when I tried to accelerate it hesitated and had no power. Brought it back to my mechanic and he said it was misfiring on 6 of 8 cylinders. Replaced the Bosch plugs with AC Delco iridium and no misfires. For some reason they just didn't work in my Hummer.
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