I've had my 2006 H3 since March this year and it only had 60000 miles on it. The head was replaced at just under 50K. Anyway I have had the rough idle and the feels like it's gonna die when coming to a stop. I was a mechanic and still do some part time work here and there when I am in from offshore so I went down the list. Cleaned the throttle body cleaned MAF checked intake bolts and lines. Checked out all ignition out. Everything was OK and no miss fire found when I borrowed a scan gauge from a local shop. I was leaning toward fuel delivery. Sitting at a light the hood was shaking something terrible.

Anyway I have used sea foam for years fogging engines on cars trucks and motorcycles and I love the stuff. I have never added it to the gas tank on any of my vehicles since I run top tier gas in what ever I own. I got to thinking the prior owner probably just ran what ever gas in it they wanted so I dumped an entire can in on Wed filled it up and took a 100 mile road trip. Got off the interstate and seriously thought the engine had died at the light. Rough idle and stall feeling is gone so must have had a dirty injector.IT's really smooth so if you have gone through the regular run down on rough idle give it a shot.

 

I sure wish sea foam worked for me.. I have done almost everything, from T-body cleaning, MAF cleaning, air filter, new spark plugs, new coil packs, gumout, techron, seafoam, STP, and I still have a rough idle. Steering wheel and dash vibrate noticeably. Haven't had a misfire code in a while though.
2006 Adventure H3 with 74k miles. 13 MPG on average..

 

I add Seafoam to my diesels about every 4th tank.

 

I have never used Seafoam, always use Chevron Techron to keep the injectors clean. It's been working great so far but I may try Seafoam next time as a comparison.