Downshift or holding back when descending on a slope
It seems to happen only on a particular decent - as I am coming down the
slope my car seems to shift down or hold back (makes a different noise too
loud hum) coming down the cut. I have driven it through the mountains and
passes, some steeper and longer than this particular stretch of highway and
it doesn't seem to do it. Also can't seem to find the sweet spot when doing
40k... 4cyl automatic transmission -141000k (tranny serviced at 100000k),
tries to find a gear to stick to.