Consider picking up a flush. It'* pretty easy, you usually remove the coolant, flush with clean water. Add the flush chemical, run for a while.. remove it all, fill w/water, run a while and then clean out and refill with coolant/distilled water.

Had the coolant in the car ever been changed? Advice I got was change it every two years and 24-36000 miles just like regular stuff. It'* great coolant and preservative but there'* something quirky after it ages with air mixing into it in a system run low or just with age on it...

It was flushed with a flush three months ago. Thats why I'm kinda disturbed.

$90 ? Sounds like you did not install a new UIM, just a new UIM gasket. Is the UIM the original? Did you check the manufacture date using info from: http://www.bonnevilleclub.com/forum/...e=article&k=38
If you re-used the UIM, did you probe the EGR bore for softness? The EGR bores in UIMs typically are coated with carbon and look fine when, underneath, they often have been damaged by heat exposure.

I just re-used the UIM, everything looked okay to me. Gasket replacements only.

Could be a problem. They often look OK when the plastic has deteriorated badly. Before re-using a UIM, you really need to probe the bore. If it is soft, it may not be long before the coolant pressure pushes through the softened wall and fills your intake manifold with coolant. Check the date of manufacture on the UIM. If you haven't already done so, please read the Techinfo article linked for you above.

I've seen an UIM manufactured in 2002 fail. I have that manifold at home. It was installed on EK98'* car.

If you don't get the sleeved UIM, you are at great risk. And your crank and rod bearings may pay the price for it.

I will have to check into this. I don't care if I have to tear into it again and spend another $100, I just want it fixed right. Looks like I'll put in an order for one and give her another try this weekend.

As long as he changed the UIM with a new one, he'* not at great risk in the near future. We have not seen any cases of a new UIM showing signs of cracking/hurting a motor in under 30,000 miles to my knowledge.

This is something to consider though and should be kept in mind if you see a great price on Ebay or hear of APN running some type of promotion.