Originally Posted by Mad_Coachman
What Tech 2 is telling you is the best way to search for vacuum leaks. I found a problem with my Dorman UIM by spraying WD40 where my manifold meets the throttle body. I would never by Dorman again as it had warped and degraded above the EGR stovepipe area. A better choice is ATP which can be found at Amazon for about $85.
There is nothing wrong with the new Dorman UIM Kits, they come with the reduced diameter EGR stove pipes, which fixes the old EGR issue you speak of.
You can pay a lot more for a UIM with the reduced diameter EGR stove pipe, as well as a steel bushing in the UIM part, but for as much more that you have to pay I did not seeing going that route worth it, so far 4 years later and no issues.