I've done a lot of 3rd gen trucks from stock to large cam/turbo. Generally using the same transmission setting in most setups but some vehicles I get are just total turds down low. Don't hardly want to move from a dead stop or spin tires from a dig. Maybe something I'm missing or just some trucks move better than others. I tune a lot of vehicles MAF only Idk if this could have anything to do with it. This truck here is a stock 4x4 5.3 with mild cam but I've had lq4 trucks not want to move either. Maybe just bad cam/converter combo