Ok i jus started having this problem. When i come to a stop my truck idles real rough almost dying almost like it has a lope to it. These are the codes i pulled. p1280 p1670 p0340 p0470 p0732 p0720. the last 2 are a transmission code and speed sensor code which are from my truck starting off in second gear which i have found to be linked to low voltage. one is an exhaust back presssure one i believe is due to not having a muffler. but the first 3 i do not know about. Is there any relation to the first 3 and the rough idle. thanks in advace for the help. Will. Oh and my truck is the one in my signature.