Damp weather rough running until warm.

Cyl 3 fault code. Switched wires and fault stayed at cyl 3 so I'm supposing bad coil.

Advance Auto has a few options: Thoughts?
Carquest $85

Beck/Arnley $96

NGK $120

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Diamond or Subaru OEM. Nothing else is suitable. 

You should check the plug, injector, and compression first though. Swapping wires is not a sufficient test to call out a coil pack. 

GD

Edited July 7, 20214 yr by GeneralDisorder

1 hour ago, GeneralDisorder said:

Diamond or Subaru OEM. Nothing else is suitable. 

You should check the plug, injector, and compression first though. Swapping wires is not a sufficient test to call out a coil pack. 

GD

Only happens after severe weather or if inside very damp garage.

Could still be a cracked spark plug, etc. 

GD

agree with GD - dont assume - know.

easy way to know.. wait until after dark, fire it up and pop the hood... use a spray bottle to mist a little moisture over the coil pack and/or around the suspect wire/plug

if it is the coil, i guarantee you, you will know. there will be a light show from it arcing.

they are sometimes bad enough to not even need the moisture to see, or to wait until after dark for that matter...

this was my 95 Legacy - broad daylight... this is what you are looking for.