05 duramax with the edge 1.2, 4" catless, Finger stick and block off plate. I was having some problems with smoking before the finger stick and block off plate when idling in gear. (like everyone else) It stopped with the install of the stick and block off plate. The last three days it is doing it again after six months of no problems. I checked the connections and couldn't find any problems. Any idea's:help:

that is a sign of a possible injector issue, but first go here and verify you have all the latest updates on your trucks computer. http://calid.gm.com/vci/VINEntryPre.do