Hey Gulf,
Thanks again for your input! tomorrow after work i'll take the upper intake off, and clean all the gasket surfaces and put some RTV between the intake and all the gasket surfaces (IACV, TB, FITV, and upper to lower intake) to try to eliminate the leak...
I did a full tune up a few weeks ago, and i did have to remove the upper intake to change my heater core hoses, and i reused the old gasket so maybe something was disturbed... also i took the throttle body off to clean it so maybe that gasket might have a leak.
I tried the propane trick and it didnt detect anything, but then again i could only use it to get to about 40% of the flange surfaces. After I regasket all the surfaces I could plug the vaccuum lines to the intake coming off the PCV and the brake booster to isolate the problem, then maybe see if there is still a leak...
Any thoughts on this idea?
Thanks!