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There is a fuel system treatment that Chrysler (per the TSB on the lower plate for the plenum) does. See that the service for it is flat fee $100 at most Chrysler dealers. Helps to remove all the carbon build up. There is a direct line feed, then a tank treatment.
Seafoam. Good product to keep the fuel system and air intake clean.
Also, using gunk motor flush, 1/2 bottle, just before an oil change. I'm doing this twice a year. Running the Purolator L30001 oil filter too.
