My 2004 Chrysler Pacifica has been lurching at low speeds. My mechanic replaced the MAP sensor and mentioned that there is a lot of carbon buildup in the engine. The replacement of the MAP sensor has not improved the performance. They also did a top engine cleanout, which I'm assuming is the method of injecting Seafoam through the vacuum and into the engine? When none of this worked, they suggested that I run a few tanks of premium gasoline through the engine with a few cans of Seafoam included. Is this stuff safe to use in my engine? I've seen a few comments out there that if strong agents are added to break up carbon, that large pieces could break free, but cause other damage to the engine if lodged in the wrong place. Is this something I should worry about, or is this even something that could help resolve my problem?