had a 2003 3500 van 6.0 48K. dead miss on cyl. 2 and so so miss on cyl 6. plugs good swapped coils, wires around to see if miss moves. EVAP smoke leak detector showed leak at intake. Replaced intake with updated green gasket. Now the fun. Dead miss on 2 is gone along with 6. BUT NOW at no uncertain time I get drop out and miss fires at idle in pairs??? 8 & 7 , 1 & 4 , and a few times 2 & 6 . fuel preasure good, fuel sample looks ok. Even swapped around the injectors? Any tips????????