I have a 2010 1500 with the 5.9 Hemi, It has the factory duel exhaust 3" in 2 1/2 dual out . I installed a Flowmaster series 10 muffler and left the two resonators on. Now I have what sounds like an engine sputter at low speed, if I give it a little more gas it goes away for awhile until I give it gas again and it starts all over again. I took it to two different Dodge dealers and they couldn't find anything wrong with the engine, transmission or anything else for that matter. Any ideas?