I have checked every hose, and there are many. There dose not seam to be any vac lines to the cruise servos. And again its only a problem after about 30 mins of driving. Anybody know what the exact logic changes occur between a cold engine and a hot engine? I assume that there are things that change for timing, and mixture after a certain point. If I knew the exact process I might have a better understanding as to where to look. I have theorized that it could be a vacuum leak on something that only opens at temperature? The guy at the dealership chuckeled at this, and said "a vacuum leak is a vacuum leak - if it were a hose you would have the problem all the time or very intermittently". But knowing all the black spaghetti on top of a 3VZE, I am sure some of that stuff makes changes after reaching a certain temp.

Here is a side question... is it possible that there is a problem inside the brake booster diafram? how would I go about testing that? I have a really fancy vacuum gauge but not sure how to test something like that.