I have an ls1 with a custm O.S. and a 2002 reflash( 2000 pcm) Problem seems to be that I cannot get the idle range AFR to go leaner then about 11.5:1. I keep auto tuning and everytime I do the paste and multipy to lower the VE on the overly rich cells, it multiply's them by .80. The numbers in my VE chart are getting really low, around 30. It eventually starts to bog real bad with throttle tip in. The leaner I make it(even though it does'nt get any leaner) it make the surging idle problem I have even worse. I run a 96 lb injectors. Have any ideas? Should I enable the idle STFT?? What would this do exactly?