Hokie - STI avant

1 inch diameter black hose near firewall with screw/****? I had my hood open and it starting squirting fluid all over the place. I tightened up the screw to stop it. What does this hose do? It goes through the firewall, directly in the top/middle.

Also, my car is heasitating when I step on the gas. The idle also is unstable. I recently had my MAF and a cat replaced to supposedly fix this problem. Now the problem is back along with the rotten egg/fart smell. The ISV was checked out and its fine. I don't know what else could be causing this problem. Thanks for any info!

Mike

MikTip

routes radiator water through engine block to heater core in your dash

QCRAZY

Sounds like your O2 sensors are bad!!

vert1go

i had the exact same problem with hesitation and rough idle but my engine light also came on. Turned out to be an O2 sensor.