please help with 300..

Does it have the 19 gal fuel tank? There is a recall for the fuel tanks on them due to the rollover valve becoming distorted and shutting off the fuel flow. The NTHSB forced Chrysler to do a recall and give an owner independent lifetime warranty on the 19 gal fuel tanks as a result of stalling and non-start issues. I think the 3.5L AWD cars had the 19 gal tanks in 2007. If you have the 19 gal tank, Chrysler will replace it for free under the lifetime warranty.