2000 Rodeo Engine Revs unsafe to drive

As indicated, have a 2000 Rodeo V6cyl auto rear wheel drive that the engine revs slows revs on a continuous cycle and I can not figure out what the issue is. I know there is a long history of this problem with Isuzu Rodeo's as all you have to do is go to the NHTSB complaint center and there are issues concerning this for the years 1997 and on, but no solutions.

Everything seems to be sealed, tight, and not leaking but I know little of cars of this type and have no idea what to search for or replace.

Intermittent, started a few months ago when the AC was turned off and now it happens at will with no indications that it is going to occur.

Any help appreciated.

TIA