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Good work on fixing the idle. All those things you have done are essential for these engines to run smoothly!
As for the noise, it does sound like a belt sliping perhaps, it could also be the PAS pump bearing, the Alternator bearing or water pump? Try and eliminate each one by taking off the belts one at a time and seeing the result.
Other option is to CAREFULLY use a mechanics stethascope on all the rotating equipment at the front of the engine. If you hit something that is spinning, it will hurt yours ears so be carefull!
You should hear a nice constant whine from the PAS pump, no squeeling or bubbles, nice constant whine from the alternator. For the water pump probe the hoses in and out and also a couple of places on the block from the passenger side.
While you are there, also check the front crank pulley area and make sure the toothed pully is running true and not wobbling!
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