hello. i have a 02 sxt with the 4.7 in it. it has a rough idle and i dont know what it is. we've checked everything (i.e. plugs, fuel injector cleaner, filters...) and taken it to the dealer and theyre dont know theyre *** from a hole in the ground.. and also the stock radio just cuts out whenever it feels like.. anyone have any insight or have had these problems?? thanks...