1-Okay, so I have been losing coolant for a while now, and I think it is getting inot the motor somehow. ( Saw a fair amount of it running out the exhaust right after taken it for a short drive immediatley after filling it with coolant) Not 100% certain, but from what I read here guessing it is either the UIM or LIM? So how much do these cost and how hard are they to do?
2- Have been also losing power (stalling). See link for full story http://www.bonnevilleclub.com/forum/...t=losing+power
Now know it is either the crank sensor or the EGR valve. I have pulled and cleaned the EGR vavle and problem remains. SO question 2 is basd on expertise of the club, which of these is more likely to be the culprit? Which of these is more likely to be making the battery guage "dance"? Heck, what do these 2 parts even do?
I found out that I am gonna have to take it to a garage for the crank sensor, don't have access to the tools I thought I would. Gonna try to put it on the computer next week to see if I can get any codes, but trying to be prepared, ya know?

1 im ganna guess head gasket on that one. as far as i know the uim and lim have nothing to do with it going into the exaust.

2 dont think egr valve would have anything to do with the voltage meter goin crazy...
try wikipedia for what they do

Here is my opinion on the first question. I would bet you have an UIM failure. If the leak is bad enough to spit it out the exhaust I would say that this could also be your reason for the stalling and power loss. Due to coolant leaking into the combustion chamber and killing the spark. This would cause it to run very rough and also stall. I am not a pro and I am sure one of the resident gearheads will chime in soon. I would also recommend not operating the car anymore as you could blow the gasket too much and cause Hydrolock. You will then need to rebuild. Save yourself some money and fix the UIM with one from the two members here that customize them to never fail again. I would do it now before it is too late. This is a common problem to many members here. By the way I have also found from other members here that it is very rare for head gaskets to blow on theses motors, and that they have only confirmed 4 cases so far. Good luck.

Also, when you do the upper, might as well do the lower & coolant elbow.

I've been thinking I would do both upper and lower.
I figured it wasn't head gasket. I've had that happen before and it doesn't seem like that. So how do I do the UIM and LIM and how much do they cost?

Please read the Techinfo article on this problem: http://www.bonnevilleclub.com/forum/...e=article&k=38

If you do the work yourself, about $220. If you spend some time reading the links in the above article, you will see several examples, including photographs, of how to do the repairs. If you have it done, maybe $350 - $500. No matter who does the labor, I recommend the APN upper kit and GM aluminum frame lower intake manifold gaskets.