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Your SUV is really giving you a hard time, lol. Sorry but I've had those days too. I would try to check if you have blocked EGR passages. If ok check for restricted MAP sensor vacuum hose/passage or restricted exhaust. I know you replaced the CAT but if the muffler is blocked then there would still be a restriction. Also check the wiring and connection to the MAP sensor.
The crank angle sensor has no individual testing procedure. Diagnosis is by verification of repair by replacing with known good component.
Check to see what the Diagnostic Trouble Codes from the ECM are. There are only one or two that directly relate to the CAS.
There is a small seal for the shaft of the CAS, where the drive gear passes through the body to drive the wheel. If this seal has failed, and at this age, it is possible, then the incoming oil has likely fouled the CAS, and is why the CAS won't work.
Unfortunately, there is no seal replacement. The only way to repair the CAS is to replace it.
Please post what engine you have! There are a couple different motors offered.
You should be able to follow the upper radiator hose to the t-stat housing on either the 4cyl or gm V6, I 'm not sure if there is another engine option for that year. I was previously a Isuzu tech 10 years ago, but am not up to date on newer models.