you can see the mods in my sig. it's on an 06' 4.6, truck runs perfect, idles fine, pulls like a mother fkr, and cruises fine. but when the truck is in neutral or park, and i hold the engine at 2k-2100, i can watch the motor (hood open duh) get a mean shake to it, looks and SOUNDS like a good sized miss... but, no check engine light, no signs during actual driving... only other thing i can think of is mabey thats just the sweet spot for the ****ty factory engine balancing?

 

the dealer would confirm it an identify witch one. Moto Blue suck. I installed them and one failes within 30 days. I would not use them again.

 

i just dont understand why only at that rpm... all others are fine... i'm not doubting you, cause i've never heard of the motoblues till i bought them, but its just curious how it only happens at that rpm

 

Pay the dealer $75 to diagnose it. Ask them to place the bad coil, if it has one in the #1 cylinder or just pay them to replace it with a motor craft one. Its easy to replace the #1 yourself and you can get a replacement cheap.

 

guess its a good thing that i keep all my original parts, by the way, even though it failed, did you knotice any difference with those coils? i did

 

Yes it seems to run better. If they wont hold up it aint worth it though. I dont want to screw around with them They should last 75-100K. I'm sure I'll end up replacing them all before that..

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Well guys use some common sense.
Any coil or part for that matter from any source can fail at anytime.
If Motorcrafts never failed, no one would ever have a problem with coils to have to replace, but that is not the case.
I bought 8 from another vendor and had 3 fail but I got replacements and still run them. No use to go into condemnation over some failures.
A lot of the parts you get today are made "off shore" so the quality is down but on shore parts fail also.