throttle is all controled by your ecu. a tune would do that but i would recommend it. try getting a trifecta tune if you want all those adjustments your looking for. Vince does the tunes and I have it for my LT 07. I love it, I just told him what I wanted and what Mods I have and he did what I asked him to do with the tune and the adjustments. trifecta is where you wanna go 250 for the tune 200 for the device. but its a deposit till they get the device back so your really paying 250. its well worth the money TRUST ME I KNOW.