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I have never ever had a problem with Champion spark plugs. I’ve been using them from the mid 70s in all my Mopars from stock, mild to wild. My last engine dynoe’d at 655 hp and 620 tq. I tried other brand plugs and always went back to Champions. Kim

Talk to the mechanic. Certainly he had to notice it wasn’t right when he drove it out. They should of told u there was a problem and not let u take it. Kim

5&7 or 8&4 are probably mixed up. Kim