Every sixpack I have tuned leaves my house running better than when it arrived. I would try adjusting the front & rear carbs. There are adjustment screws in the front of the base plates. May have to pull out the lead plugs if original. I made a long thin screw driver type tool out of a piece of coat hanger & flatened the end like a screwdriver so I don't have to remove any of the three carbs to tune. This was the cure for mine.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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