98 Explorer xle tune-up problem

[ChristopherM]

I just changed the spark plugs and oil in my 98 Explorer XLE.I have 162,000 miles on the motor. I used the Motorcraft spark plugs and Motorcraft 5w30 motor oil. I am now getting worse gas mileage in my truck. Does anyone know what could be the problem? The way gas prices are climbing I can’t afford it.

 

[Blee1099]

Did you gap the plugs or throw them right in?

 

[ChristopherM]

I threw them right in. Should I take then out and gap them? Would that make a huge difference? its only been a week since I changed them.

 

[det107]

All spark plugs should be gapped before installation-

 

[Joe Dirt]

As said- all of them need to be gapped. And yes, unfortunately, it can make that much of a difference...