V6, 108k Great CA smog numbers 2 months ago. Runs fine until CEL comes on, then idles and runs rough enough can pull any plug wire off and no difference. Randomly comes out of it and runs fine again. Indy garage says they can’t find why. Another IG says past 96, so they can’t do it either. Is dealer likely to know something they don’t? I’ve had it since 98. Been a problem for about a month.
Yes, I’d take it to a dealer on principle. They’ll be best equipped to diagnose the problem.
My 92 Dakota did the same thing, A new set of dealer supplied plug wires cured it.