3.3 liter V6 spark plug replacing

Here are the major steps I took:
0) Wait for engine to cool and disconnect the battery.
1) remove the 4 bolts securing the "distributer" - this is required to gain access to the 4th bolt on the plenum.
2) remove the 4 bolts securing the plenum.
3) remove the bolt from the alternator bracket to the plenum.
4) remove the hose between the air filter and the throtle to gain access to support clamp and pipe to exaust both on the drivers side of the plenum.
5) remove the two bolts securing the pipe from the exaust to the plenum - do this at the top as the top bolts are less likley to be rusted. These are near the firewall and the bolts face up.
6) remove the bolt on the support bracket on the drivers side below the plenum.
7) disconnect a wire mounting on the back passenger side of the plenum.
8) remove two hoses connecing to the plenum.

At this point you can move the plenum back away and get good access to the sparkplugs.

My gasket fell apart - however Auto zone had a replacement for $3.99 and Murrys had one for $2.67.

One recomendation - once you have the plenum moved you might want to put a rag or paper towel to catch any crud from falling down into the intake manafold.

Hope this helps.

When I start the engine, I hear a very loud, high-pitched squeal. It is so loud that I have to wear ear plugs. Also, the idle is running very fast. I am guessing that there is a vacuum hose that is either cracked or disconnected.

The noise is coming from the passenger side of the engine.

I've removed the plenum again to check for any loose or disconnected hoses but could not find any.

Has anyone else encountered this situation?
If so, do you know the cause/solution?

Any tips are appreciated.
Thanks!
-STL

I put the front wheels on ramps and crawled under the van. It's tough to reach, but the plugs can be changed (at least on that model year). Thank goodness there's only 3 to reach.