97 Wrangler - Loud squeal under hood
 

I have a 97 Wrangler(Auto) with 65,000 miles on it; I started gettting this
loud squeal from under the hood at idle, however when I accelerate it goes
away until I am back at idle, but it will also occasionally stop while at
idle for a while and then just start back again. I had the serp belt
replaced, thinking it was the old belt, but it still continues. Took it to
the shop for some other work and they couldn't get it to make the noise
while they had it. With the hood up while it is making the noise, I just
can't seem to pinpoint it, though it seems like it is coming more from the
left side of the engine bay. One of my co-workers suggested a pulley. Any
other suggestions would be greatly appreciated. Thanks.