Every spark plug that I replaced at 100k that had not been regapped at around 50k, had a gap burnt out to almost double the specs. That alone is why one will run so much better after the plugs are changed out; the gap is back with in specs.

John Luttrell
2001 4x4 short cab, 3 inch lift with 33 inch mudders and Powertrax no-slip in the rear


1991 Jeep YJ, 4 inch suspension lift on 33" BFG's