Bad Catch Can?
 

I installed a Mishimoto catch can yesterday. Since there is one input and one output, I tough it would be easy. When I started my engine today, the idle was REALLY roughh. It was going from 500 rpm to 2700 rpm then get back to almost normal before to stop. If I touched the gaz, the engine would also stop.

I reconnected the way it was stock and my car is now running normally.

It was installed on the circuit in the back of the engine ( the one that start from the head and goes into the intake manifold. I didn't have any leak...

Am I the only one who got such issue?

You have a vacuum leak somewhere. Most likely the can or the tubing.

-alex

That or your containing the system.

Could be blocked airflow. Report back.

not doubting you.. but did you hook it up to create a proper vacuum?

I corrected the problem for now, I uninstall it... I will try to find to change it's location...

Have you got any photo's of when it was installed? Just curious as I am installing mine and not sure where the best place to mount it would be.

The best place I found was to delete the filup windshield washer conduct and put it there.