My r5 which has been running really sweet on standard boost, and standard fueling however it has all of a sudden developed a pretty constant popping when coasting or the revs drop. Another problem that has started at pretty much the same time is that the idle has dropped by slightly and the idle is now very lumpy. Im guessing that this is all going to be down to fueling, and once i get home ill give the idle jet a clean out , however is there anything else i should be checking.