Today I got P303, P300 and P304 codes on my SRT after a rough idle developed and the check engine light came on. Upon close inspection I found that a rubber hose that seems to come out from under the intake manifold at the center rear of the engine and run through the center of the firewall had become old, soft and sucked shut. I was able to remove about a 3" piece and splice a new hose piece to it. It runs fine now but I would like to replace that hose. Does anyone know where it connects to the engine and where it goes behind the firewall ? I have a feeling it will be hard to replace?
Anyway be aware that the hoses are over 15 years old and mat go soft or crack.

Any help would be appreciated

 

This is the hose. It is 1/4 " dia.

 

It’s small so don’t sweat it.

 

Bump

 

Just replace it with another hose no biggie then reset those codes

 

As far as I recall the only vacuum lines behind the dash are used to control the heating and ventilation system, they open and close diverters.

 

I believe it runs into the supercharger. What purpose it does I dont know, but if you look at the blower you'll see 2 hoses on the rear right (driver side) that have hose attachments. One runs up front near the egr valve on the passenger and the other runs down and under the the firewall to where I dont know.