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#1 is probably normal engine operation. I've noticed my matrix will idle at about 1100 rpm in neutral most of the time. If I stop at a light for a while, it kicks down to 750.
#2 is probably a scangauge quirk. The engine probably does go into open loop for a fraction of a second. So, the scangauge updates and sees its in open loop. The engine quickly changes back to closed, but you have to wait for the scangauge to update again to see that its back in closed loop. There is a setting somewhere in it to alter refresh time. By default its set to slow or normal. There is a fast option, but honestly it doesn't seem to make a huge difference.
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