Have you taken the feeds from the back of the engine and the right angle off the plenum?
If you have used the right angle off the plenum then this is your problem.This needs blanking,if you look to the left of the plenum you should see a black rubber cap with a clamp round,take a feed of that and use the cap to blank the plenum pipe.
I run the ARC can and that's how it's set up with the other side connected to the intake.