Thanks to Gary, John, John and all. It seems that a carb adjustment has worked miracles with respect to the backfiring and rough running at low speeds. All the irritating things that happened on my trip to Pigeon Forge are gone. I failed to tell you all that I have the electronic ignition replacement for points/condensor, so that wasn't the issue, as many suspected. Sorry. I plan to have the carbs rebuilt over the Winter so that may resolve any other fuel issues. I am still only getting about 12 mpg on the highway at 75 mph, so I figure it may just be rebuild time. The only other issue I have is an intermittant vibration which a friend here thinks is a transmission mount problem. Don Verity rebuilt the transmission and it is great. Shifts crisply and seems to be just fine. Usually, the vibration is when I first take off when everything is cold and occasionally other times. It is a rapid vibration and not too severe, but noticeable. I have new/rebuilt everything in terms of rear end, universal joints, springs, shocks. Any suggestions? Thanks again for all your help. Tom ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/8LmulB/TM --------------------------------------------------------------------~-> To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/