Seafoam is great!! I have used it on everything from Lawn mowers to my diesel.
My wifes car was throwing a code that indicated a stuck intake damper valve. It is about a $1K fix!! I put seafoam in a water bottle with a very small hole in the lid, pulled off the intake tube and started her car up. I would squirt the seafoam into the intake till the cars idle slowed then stop. Did this for half the bottle. Finally started it back up and then gave it a pretty good spray till it died and left it sit for an hour. Put it all back together and she has not had an issue in almost a year!!
Chris