I had posted a while ago about the car feeling like it's missing in 3rd and 4th on the freeway, but not when I get off and try to duplicate on a 45mph highway.

I added grounds - didn't fix it. I changed the fuel filter (OEM) this morning - didn't fix it, but definetely running richer on the a/f ratio gauge.

This evening I changed plugs and the little post in the center of the cross at the base of the 7EQ's was considerably smaller than the new plugs. This fixed it.

I changed plugs last because I had just changed them about 2-3 months ago. Anyway, it must have been longer because they were the problem.

Next time I'll check plugs first...

 

My car's doing something funny and I have a new set of plugs setting on the shelf. Humm... Gives me an Idea