I recently changed my plugs and wires, with new Motorcraft wires and Motorcraft Platinum plugs. Since changing them my gas mileage has dropped like two miles a gallon. I was at 16is avg, and now at 14ish. What could it be??

 

my guess would be your gap.

 

what should the gap be?

 

My guess would be it"s on that sticker in front of the radiator.

 

i may be wrong but the gap is something like .41 inches

 

You may be wrong but not by much.

 

it may be .041" def not .41" but its on the white engine placard.

 

What engine? My 4.0L SOHC calls for a pretty big difference in acceptable gaps: .041-.060 if I recall. As per the sticker on the core support.

 

.044 is what i believe the OEM spec is
at least thats what the orillys guy said

 

yea i messed up forgot the 0 thanks

 

i will pull them tomorrow and check