See this:
http://www.hemmings.com/mus/stories/2008/01/01/hmn_feature19.html"Numerous cold starts and warm-up cycles, excessive idling, short trips, and around-town motoring where the stop/start action is amplified are all ideal conditions for rapidly forming carbon deposits."
"The best defense against deposit formation is a fuel that incorporates the necessary additives, designed to keep the system clean and/or to remove existing deposits."
"Though carbon is going to form, you can limit its creation by using name-brand gasoline that contains a fuel system cleaner, limiting idling time and cold starts, employing high-quality oil and keeping the carburetor/fuel injection system tuned properly. Once these protocols are invoked, a semi-annual chemical cleaning will keep your engine carbon-free and in top running condition."
The author recommends Chevron gasoline with Techron as the best known engine deposit dissolver. I poured about 10 ounces of Techron in my gas tank each time over about four fill ups, and I did notice a difference: the engine quit dying 3-4 times on cold startups. This is my daily driver, a fuel injected V6, not a Mopar. Now I always buy Chevron for this car. When my 340 gets running, I'll be using Chevron, and I might be cleaning out the carbon deposits as per the link above if there is accumulation.
