Pontiac Repair: Car Sucks, pontiac bonniville, upper intake manifold

Question
My car is a 2002 pontiac bonniville 3.8 W/o turbo i replaced the heads the gaskits the upper and lower plumen i had the intake checked and I took in to the dealer ship the problem is in suckes air from the oil inlet kind of like sucking on a bottle if you open the oil cap the car dies and if you put your head put to the inlet you can feel the sucktuion it'll run but it starts missing after awhile and i am afride the pressure will crush the motor so what do i do

Answer
Hi Jesse:

Well it's one of 2 things. Either you are missing the o-ring seal under the pcv valve in the upper intake manifold or the valve all together if you replaced the manifold "upper" you may have for got to swap the valve and or the seal. Or under the upper intake manifold there are 2 of the lower intake manifold bolts ther are in the front and rear corners if theose bolts are not tight it will leak vacuume that way also. It's one or the other. Good luck :)