Mod (Ret.)

I installed a set of these in my 4.2 V6 ('05 STX). I remove my plugs every 6 to 8 thousand miles to inspect how each cylinder is doing. I have a set of "plain jane" champions, and currently the Bosh platinum 2's. I have to admit, the idle really smoothed out with the Bosh plugs; I used to have a slight stumble every once in awhile. Smooth as silk right now. My SCANGUAGE II does not show any big increase in gas mileage though, so don't pay the bigger bucks for them if you expect that.

Cold

BUT i bought the E3 spark plugs and all i can say is WOW!! truck ran AWESOME after the change!! i got a custom tune with an HP tuner and on my first pull after the E3 change, it banged out in first gear!! i was like WTF then the same thing the second pull. I was still like WTF lol, then the computer corrected the problem and never looked back lol. i guess the ECU was in SHOCK!!