AKEgerer

(still another.....indirectly related) Be careful about your catalytics glowing red for too long. If the exhaust fumes are too rich (as mentioned in an early reply) and gets burned in the catalytic converters, the actual catalyst on the meshwork inside the cat. converters can actually burn up and become eradicated, leaving you with a see-through converter. Naturally, without the catalyst and meshwork, the car will fail a smog test. Avery (I'm actually looking for periodic power loss when the engine is cold...and I keep coming back to your thread; thus my many replies ;0)

(ADDENDUM by Avery....prev. post) I forgot to add: If my post makes sense and is possibly pertinent to your situation, then follow the tube that has the "EGR antifreeze leak" all the way back to see where it attaches to the engine/exhaust manifold. (I haven't looked at my LS, and don't know the schematics by heart). But if the EGR tube goes back to a cylinder or engine side (left vs. right), then take out the specific spark plug (or entire side of 4 plugs). A head gasket leak will leave you with a wet spark plug rather than a dry, clean plug. I can look at my car if this is an option for you. Avery

You mention the hose below the egr.... is it the actual hose TO THE EGR? If so, my understanding is that the EGR (exhaust gas recirculation) comes from the exhaust manifold, and back into the intake manifold. This is so that some leftover unburned gas that leaves the engine gets recirculated back into the engine for secondary burning. If there is a head gasket leak, then the antifreeze would be leaking into the cylinder and out the exhaust, and poss. into the EGR (depending on which cylinder is leaking). When water (i.e.,antifreeze) gets into the cylinder, it vaporizes; this is one reason that white smoke comes out the exhaust pipe. It would also cause the car to run very, very rough. I had this happen to my 280Z, and there as a LOT of white smoke, and very rough idle. I hope that you don't have a gasket leak, but it's not too hard to fix...but not terribly easy either, but a mechanic friend should be able to do it for you for a good price. I hope this helps, and perhaps someone else can correct me or give alternative repair/diagnostic info. Avery