Can't tell much from that description, but backfiring through the carb can be a lean condition. I have had that happen with dirty carburetors needing a rebuild. Bill Huff At 10/9/201110:17 PM, JettLarry@xxxxxxx wrote: > > >The situation: 1963 300 sport...413 w ith 105K >miles, 152-160 pounds compression in all 8 >holes, brand new plugs, wires, Edelbrock 650 >carb, Mopar electronic ignition system. At WOT >at 30 miles per hour in third, it coughs >(backfires) through carb repeatedly. Is this a >result of too much or too little advance of the >timing or is it a carb problem concerning too >rich or too lean? (New thought) today with 600 >pounds of weight in a utility trailer behind, it >did not do the coughing. Shouldn't be worrying >about this with Lake George eminent, but hoping >some tune up genius tells me what path to take to correct. > >[Non-text portions of this message have been removed] > > [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to http://autos.groups.yahoo.com/group/Chrysler300/join and select the "Leave Group" button For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylangYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: Chrysler300-digest@xxxxxxxxxxxxxxx Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> 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/