Hey guys i just got my car back from the shop. The engine was rebuilt with new pistons and a new head. The engine(B18b1) consists of a 95 LS short block and a 99 b20 head.

Now when i got it back, there was no hose that connects from the head (see picture 1 circled in red) to the intake (see picture 2 circled in red)

#1
#2

So i bought a rubber hose from Home Depot and connected these two parts. My engine started to idle around 2k... WHY?

When the rubber hose is NOT connected, my engine idles below 1k and fluctuates back and forth like it WANTS to die.

Can anyone explain/help me fix this problem???

TIA

 

it might not be what you think check your map sensor and see if there are any vaccum leaks that hose should have nothing to do with the idling prob.