Okay guys, I'm stumped. My old factory carb took a dump, so I decided to, instead of rebuild the factory one, swap it with a weber. Well, I can't get her to idle. I can get it started and rev it without issue, but the RPMs just drop and it dies. I have the 32/26 weber that came from Low Range pre jetteed with an electronic fuel pump putting out 2-4 psi with a regulator set at 2 psi. All lines to the manifold have been plugged. and the vapor vent is going to the charcoal canister. I have also been playing with the mixture and Idle screws. I also noted it would backfire through the carb on occation which is odd because it was Running well before I swapped carbs, and I rebuild the head not long ago. I also have a pinhole leak in my radiator(would it have an effect on the water choke carb?) Should I play with the timing advance? I need some Ideas here guys. Thanks in advance.