I would lean it up just a bit. You will get the MOST POWER when your air fuel is between 12.5 and 13.3.

Dude you are running extremely lean. the air fuel ratio should be around 12.5 to 13.3 when you hit the gas i jumped up to 16. 14.75 is where all the gas and air burn perfectly. you will see more power running a little bit richer. Im guessing around 5-7RWHP. I have a 07 Silverado 5.3L with around ...

I ran the Vararam ram air intake on a 07 silverado with the 5.3l. Yes it is better than stock, but not by much. this yahoo above me must be a sells rep. because I dynoed my truck with the vararam on it along with the edge programmer on level 4. I also had a Jet MAS Airflow sensor, Shorty Headers and ...