Carb troubles. High Altitude.

Hey fellas, I live here in Montana at about 6200 ft of elevation. I just finished my build and im having a bit of a problem with my carbs. They have been rebuilt with 132.5 mains. I am running pod filters and emgo shortys.

So, with the 132.5's, it idled smooth but when running it down the road it backfired and such and basically had no power. So, I decided to change my main jet to a 142.5. Now, it idles with the choke on but it wont really accelerate, and when i push the choke in, it instantly stalls. Im not very good with carbs so I dont really know where to start. I thought for a second it would be maybe the idle screw? Or is some mixture messed up. Ive heard guys talking about their needles and where they should be placed, but i dont know much. If anybody has any pointers or tips it woud be greatly appreciated. Maybe Im just missing something simple?

At altitude, you need less fuel, not more, and the timing may need to be advanced.

So im just going to have to figure out the proper jet size then, between the shortys and pods and the elevation i think its going to take some time to figure out. Is there any other jets that anybody recommends changing, like I said, this stuff confuses me.

A lot of people tend to tune carbs starting with the idle and moving up in RPMs. Tune your carbs from full throttle and work your way down.