Hello I have a 2000 Silverado 5 speed with a cold air and a flow master exhaust. I don't know crap about this efi tuning but my buddy is big in the diesel tuning world and has offered to tune my little truck we just need someone to email us a tune that works he could possibly build off. He has said that it probably only uses ten percent of its fuelnmap at low throttle input and if we could use all of it is have a lot better low rpm performance for off roading around my property. Can someone point me in the right direction?