Yes, you can spray the Amsoil "Power Foam" to clean the intake and throttle body. It will foam up for about five minutes on hot metal and will clean varnish and carbonacous deposits very well.
Back when cars still had carbs I'd run a can through each of my engines once a year, with the engine running at a fast idle. When I got to the last 1/4 of a can, I'd spray the stuff fast enough to stall the engine, then fill the entire carb throat with the stuff. Let the engine soak for 15 minutes and then replace the air cleaner and take the car out on the road. Keep accelerating hard up and down until the blue smoke went away and you could see out the rear window once again.
As 59 Vetteman mentioned, it's also excellent as an engine degreaser and washes clean with water ...One of the active ingredients is "Butylcellusolve", which is a very effective solvent.
Tooslick
[ February 15, 2004, 08:10 AM: Message edited by: rugerman1 ]