Replaced all the O2 sensors maybe 500 miles ago.

Haven't had it fluctuate since I started this thread, it's just so random and rare, probably some wire somewhere.

IMG isn't to bad to do, but it depends if you just lift up the manifold or actually remove it. I like the idea of actually removing it so you can really clean it and clean up the gasket surfaces, also with it removed you can change the thermostat. But it can be difficult to get the bolts for the fuel lines off the back of the manifold and changing the thermostat requires a universal joint 12mm socket, not a 12mm with a universal added to it. Also other things here and there, I could tell people if they really wanted to know.