I have, as well as the CTS, these two sensors are my last hope to fixing my running rich and rough idle. Before you say it, I've gone through your tips, I'm also convinced my 4.0 doesn't leave open loop. O2, tps, iac, all that good stuff has been replaced, last options are these two sensors.
I'm suspicious of the O2 sensor. Got 12 volts to the O2 heater?