Hey Gang, I was getting a stumble so I replaced my coil which seems to have helped (Accel 14036). I also replaced the plugs with NGK TR55's. Ford's spec for plug gap is a range from .052 to .056.
Why the range?
Does it matter where in that range I gap them?
I've read others with a performance coil gap out at up to .062 or even .064?
Anybody have any advice or recommendations?
Thanks -Ken

 

I have always kept mine at a .056 gap and have not had any issues. I usually change the plugs every 2 years. The gap i believe has to do with the compression ratio but its minimal difference so you should be fine either way you go. If your still getting a small stumble try replacing the wires as well, make sure they have little resistance in them, that will help as well.

 

Thanks Stang. I gapped mine at the biggest end of Ford's spec (.056). Seems to be working fine. I remember reading about gaps somewhere here, but can't find the post that really helped me understand.
I did the wires last year thinking it was the quickest and easiest fix for the stumble. I used MSD performance wires. It helped, but didn't kill it. So far, the new coil might have done the trick.
Anybody else have any thoughts or opinions on the gap?

 

How many miles is recommended to swap plugs and wires? My mechanic says I could got to about 100,000 miles. I'm at 79k now and bought the car with 61+k