I need some serious help here. I did a Seafoam treatment on my '03 MCS today where I put about 1/3 bottle into each the gas tank, the oil, and the PCV vacuum line. (There was a point when I was putting it in the vacuum line that the hose slipped out of my fingers and sucked in a lot of air.) After letting it sit for about 40 minutes I started it up and revved (and no smoke). Anyway, I took off to drive home and the SES light came on and the engine dies every time the RPMs drift below about 1200. I'm not sure if this is related to the Seafoam itself or maybe it has something to do with all the air that got sucked in via the vacuum line. I drove it quite a while like this hoping it might resolve, but no luck.

Can anyone offer some advice or input?

 

How did you induct the Seafoam into the intake? Look for vacuum leaks where hoses were disconnected.