a bit more data to add. When I sit in the car at idle, in park I push the gas peddle and the car sort of delays in response. Rev's maybe from 600 to 1K then drops back to 600RPM. Add more pressure, increases a little to maybe 12-1500RPM and drops back again, all the time keeping steady pressure on the foot feed. When it gets up to 1500-2K, then it holds the RPMS great at the higher end.

Also, my wife tells me that last couple tanks that the mileage has gone to crap. Usually gets 23-27 mpg, now getting 17 mpg. Does this add to anyone's thoughts on the underlying problems?