Quote Originally Posted by rmcardle3 View Post
I'll check it out after looking into the CAT problem.
Ok, great results.
8mm plug wires, done.
Iridium plugs gapped 53-55, done.
Missfire condition, gone.
Seafoam did cause a "latent" engine code 420.
Delayed code HO2S 2 heated oxygen sensor, catalyst efficientcy~36 hours later.
Disconnected the battery, overnight.
HO2S 2 condition, gone (now going on 48 hours).

Great advice/information from this site! Thanks!