A known misfire? I don't know that it has a misfire so I guess not. Today I put a new maf, air filter, cleaned tb, and did the idle relearn. Went on a drive and right when I was ready to declare it fixed, it started doing it again. However I think I learned something new. It is totally related to engine temp. It's cooler today...70f. Where do y'all think the temp gauge should read? When I'm out on country roads and the gauge is a hair below half it idles fine. When I get in town the temp gauge goes to half...perfectly horizontal. There's a slight shudder when the fan kicks on and it starts misbehaving. So it started dieing in town. I got back out on open roads, the temp gauge went back to below half, and it idled fine. Does that still seem vacuum related? Very strange.