Okay, there is a rather loud squeal coming from the engine bay. Prior to the noise, I changed the LIM gaskets and the UIM, and also replaced the belt with a "W" belt from Autozone (supposed to be better from older engines). The NEXT DAY the squealing began. It seems to happen around idle speed. After starting the car and after the RPMs start to settle it will squeal for a few seconds. Also, if you give the throttle a quick tug, as it settles toward idle it will do it again. Noise also seems intermittent while driving, but almost always does it after starting.

I picked up an automotive stethoscope thinking it was along the belt line, but hear nothing at the alternator, tensioner pulley, or a/c compressor (can't really get to power steering pulley safely with it running).

Took the car to Autozone and Advance Auto to let them hear it. Both places went in to get another person but nobody has any idea what it is.

I replaced the front shock assemblies, tie rod ends, and rear struts, so I took it to Firestone for an alignment. While it was there I asked if they would take a look to see if THEY can figure it out. Three people later, they were scratching their heads as well.

I'm supposed to make a 9-hour drive on Sunday, and it is looking as if I am going to have to take my wife'* Durango because the squealing sounds so detrimental!

Any ideas?

Oh, and it does it in park AND in drive.

Did the PCV valve get replaced? I hear of this a lot when they are replaced, and not properly seated, or have the o-rings in the wrong spot. Also, you can find out if it is something with the belt by pulling the belt off, and running the engine. If it is, the noise would not be there any more. You can safely run the engine for a minute or two, long enough to determine if the noise is gone or not.

PCV was not replaced. I simply swapped it from the old UIM to the new one. I did use a new o-ring (came with the UIM) when I installed it, tho I'm not possitive I used the correct one. SEEMED to fit tho! Maybe I used the wrong one? Any info on the proper placement of the o-ring? Seemed like there was only one place to put it (in the receiving tube before installing the valve).

Oh, and I changed the EGR valve as well. Was gettin codes for that, which went away with the new valve.

Okay, I pulled the PCV valve and shook it. NO RATTLE! Someone PLEASE tell me this could cause a squeal!

Well, it'* not helping matters any. Replace it. I always put the o-ring on the valve itself, so that I know exactly where it will be when it goes back in.

That was it!!! Thank you so much for your help!