When it comes to carb's you have 2 choices. The stock carb you can't tune or do anything to. Or put on a weber and pick up some jets and tune it. It's is sooooo much easer to work with then the stock one. Just you will need to put in an electric pump and regulator. Pick up a jet smaller and larger when you find one. Once you put it on you can adjust it by looking at the plugs or pick up a wide band gage and put it in the truck and adjust from there. My weber has run for over 25 years and never had a problem once I got it adjusted for where I ran it at.