You'll have to look up each harness by vin to know exactly how it's pinned out, just to be sure, but 99% of the time when we do a cable operated throttle body 99-02, they are case/chassis grounded.
The newer trucks/cars 05+ seem to be pcm grounded.
Just a general observation, it's not the rule.
Almost all the 2002 and earlier use the one wire , flat connector.