seafoam engine cleaner, what vaccume line?

I used the fuel pressure regulator vac line. I did it twice, and still have about a third of the can left. The first shot I was able to get it to smoke a little, but it really didn't do anything for me.
 
Any vacuum line off the intake will do. Mine smoked like hell. It really helped out. Just rev it up while it's sucking so that the engine continues to run.

Kurt
 
If ya really want a smoke show afterwards.....have it suck about half the can in slowly and then just flood it out with the rest. Let it sit for like an hour and then start it up. I did this to my girlfriends escort and it looked like the neighborhood was on fire.
 
I used the large vacumn line from my intake elbow in the rear. Poured the whole can in slowly and then let it sit for a while before driving it out. I got a nice little smoke show for a couple minutes like I was in the Spy Hunter game. Before this I had a buddy that used it and his car was smokin like crazy.