I have just put a rebuild kit on a carter model n carb. Now that its back on I monkey'd with the screw above the idle needle and got it to idle but I can not give it any more throttle. And if I do give it gas it'll backfire and shut off. There is two other screws that I'm guessing they are for the air and highspeed needle. any advice or suggestions on where to find info would be appreciated. I need to get old allis back working.