I have a 2008 Chev with a new 4.8 engine and lumpy cam, and am having problems with the vve tuning. Have gotten the startup sorted out and it idles ok in closed loop but runs rough in open loop and the ltft #s are +15 below 1400 rpm, above that speed all seems good. I have tried to increase the vve table by just straight out increasing the vve table in that area(man.switch open-closed etc.) and by using stft+ltft graphing and applying that table to the vve table with appropriate maf disabled with no changes at all in the way it runs-fuel trims always go back to +15. I have lots of experience tuning aftermarket fi but my first go round with HP, and having troubles understanding many acronyms and exactly what many of the graphs/tables are for? Any nuby advice would be much appreciated-please be patient with me. At this point getting the ltft numbers in line will be a good start.