I recently purchaced and installed an edelbrock thunder avs off road carb, and for some reason its running rich, and i can't get it to lean out.. heres what i did, after installing it, i started the truck and let it warm up to operating temp, then i turned each screw in untill it ran rough, then i slowly backed the screw out until it ran smooth. (one screw at a time) that didn't work..it was better but still rich. so i called edelbrock and they said to do what i already did, but once it ran smooth, give it another 1/4 turn out. so i did that, and now its running richer.. my tail pipes are black, and when the truck runs, you can smell gas at the pipes, and if you put your hand in front of the pipes, you get gas on them.. so any sugestions? if i can't figure it out, i think i might go and buy a air/fuel guage, and use that to adjust it....but i have never had any problems getting the mixture adjusted before..