MasterofDisaster
Senior Member
A couple days ago I noticed a slight stumble in the motor around 1,000 - 1,400 rpm on city streets. Idle is fine and smooth. 80mph on the interstate is fine and smooth. No check engine light.
I changed the plugs to Motorcraft SP-509s about six years ago at about 90k. I'm now at 134k. Car is NA. Only mods are a Rousch CAI, underdrive pulleys, and ceramic coated shorties.
Think I should change plugs & fuel filter? [The air filter is fine.]
If I should change plugs, do we prefer
I changed the plugs to Motorcraft SP-509s about six years ago at about 90k. I'm now at 134k. Car is NA. Only mods are a Rousch CAI, underdrive pulleys, and ceramic coated shorties.
Think I should change plugs & fuel filter? [The air filter is fine.]
If I should change plugs, do we prefer
- NGK 1698 G-Power;
- CHAMPION 7406 Double Platinum;
- NGK 5507 Laser Platinum
- Something else?