On Sveedy the fan doesn't come on till the engine temp hits 198*. On a hot day the temp will get up to 206* before dropping back down. I've noticed that if I leave the car at idle when it's hot, that the fan will drop the temp apx 2* every few seconds till it gets down to 197*, at which point the fa...

1.) Yes, the O2 sensors should be connected into the harness where you described.
2.) no clue, sorry

The flex pipe probably cracked through at one of the webs. The braided outer sleeve makes finding the crack nearly impossible. You could cut off the flex pipe and weld in a replacement as long as the rest of the manifold isn't super rusty and you pay attention to the indexing. Though if the ProParts...