I have a 2004 pontiac grand prix GTP what is the
factory recommendation on the kind I use .. and or
your recommondation.. my gas mileage is terrible..
Normal plugs ACDelco .060 gap.
They even have a 100,000 mile limited warranty.
Could try the new ACDelco Professional Iridium - Spark Plug has the 100,000 mile limited warranty too.
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