im new at tuning gasers i only know how to tune duramax's right now. this gas truck im trying to tune has a custom mid-upper rpm range cam. i have cam specs if needed. it idles rough when it does idle but mostly will not idle untill i jacked the idle tables up. it didnt do this before i installed the cam. so im wondering if it needs tuned for it? it idles too high when you go from D to N. about stalls when going from P to D. do i need a custom OS and need to dissable the MAF like i read in another thread or will that mess up the trans operations? im totally new to this, theirs too many modifiers and fueling and timing tables to know where to dive in.