checking coils for mis-fire

[dano]

Hello all, I have an 05 Expy, about 2yrs ago, I replaced all my COP's. A few weeks ago, while hauling a trailer, I got down in the 40-45 mph range (about 1200 rpm's area), when I noticed a couple "kicks" or drops of power. At first I thought it was the road, but when on a good smooth stretch, it did it again a couple times. Got to thinkin a COP is going bad.
Does any one know if I can do the power drop test on Ford COP coils? I seen on line where a mechanic has a car running, then removes the wire that goes to a coil. While doing this, you should notice a drop in the engine's rpm, you then put that wire back on and move to the next one til you find the one that doesn't make a difference in performance. '
I would like to know if anyone knows about checking the COP's that way, and if so, will I get knocked on my ass by touching that wire?
Thanks for any information,
sincerely,
dano

 

[FordGate]

Just go to an autoparts store and ask them to read the codes (unless you have a code reader). That will tell you what cylinder(s) is (are) registering a misfire.

Your plan should work if the problem is not intermittent. I'd use rubber gloves though.

 

[SPLFTW]

I've got kinda the same problem of miss fire across the bore. And pulling coil wires is fine I tryed it with all mine to no luck but it won't shock you or anything and as of now I've changed 1 spark plugs 2 coil packs 3 fuel injectors 4 cam angle censer 5 air charge censer 6 about 4 fuel filters (and it all started after I changed my fuel tank)