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Discussion Starter · #1 ·
I recently swapped out my stock spark plugs at 91,000 miles on my 98 gt with ngk iridium plugs. $8 each. and put on a set of ford 9mm racing wires, i was hopping to get rid of the pingy noise when accelerating and improve my gas milage. i was getting about 19 mpg before and now im getting 17 mpg. What do i need to do to fix this?
 

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Discussion Starter · #4 ·
My pcv valve is still functioning properly so i didn't replace it. my plugs came pre-gapped, i bought them from sacramento mustang.
 
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