Thanks for your reply. It was resealed a few years ago. And the fact that it idles so perfectly now makes me doubt that it is a vacuum leak. Also, the vacuum gauge is alI the way to the left at idle. I thought about the cat also but other than the rough fast idle it was running strong at WOT a few months ago maybe even more recently. My first thought was that the idle control valve that I swapped in caused it but that does not seem possible. Do you know if a bad or improperly adjusted EHA can cause the issue? Bog might not be the right word. If I put my foot down it takes off but as the revs climb it feels like it is starving for gas. I also changed the gas filter and accumulator a few months ago.