its d15b2 bottom and y8 head.
its recently just startted to idle at 2 grand ive messed with the adjuster on the tb both of them and didnt really make a difference. theres alot of air coming from the back of the block above the oil filter and below the intake mani. i figured i blew the head gasket but i have no overheating issues and the water in the car is clear. also not leaking oil ????

some one help me pleasee !!!

p.s also makes like a weird noise when i shut the car off. its sounds like a huge valcume leak. but dont know where it could be coming from. all lines are good and connected ???
im clueless...

 

Blown out PCV?

 

Is the 10mm bolts on the black box loose?