Any Ideas about COP problem

Ok so this last week I hooked up my new COP set up, there is only one problem, the car runs fine and when I accelerate it doesn't studder but when it is idling it will misfire randomly a little. like it will be purring and then go PLOP and keep going. Any ideas why this could be? I put in BPR7ES gaped @ .028 when I installed it too.

Can you pinpoint which cylinder is dropping out?  Try inspecting the coil boots and make sure they arnt damaged or anything.  Also are the coils new or used?

the coils are used. I can't pin point it because it is random and not that often.

Anyone else?

One could be slipping off...

Those coils are used in 300m's so I dont know if there is a way chrysler tests them.  I work at a ford dealer and we  test our coils by using a scanner and adapters(vcm) to "stress" the coils which just puts a load on them and the tech inspects the graph. 

 
You could just have a bad coil.  Any cel?

NO cel, I dont know I will just have to look at them I guess.

quote:

ORIGINAL: dorian7

NO cel, I dont know I will just have to look at them I guess.

 
Well your not gonna be able to tell if they are bad by looking at them.  Go to a junkyard and grab a handfull of 300m coils lol.

I got random pops when i changed plugs to the ngk bpr7es also but after a month or so it didn't pop as much. Later i played around with the gap and it went away. Took out one plug at a time checked the gap played with it till i heard no more pop. Double check the gap mine was a little off like .3 on one of them and .27 on another.

hmmm. I will try changing to BPR6ES and see what happens.

well I replaced the plugs with 6ES and when I took the COPs off I noticed that there was some rust up in the bottom so I tired to remove the screw from one of them and broke the head off. So I ordered a new one of ebay, hopefully that was the problem. It was pretty fragile.