i called demon on this one and they dont know what to tell me. i have a 350 bored .060 over. speed demon 650 carb. edelbrock airgap rpm intake, dart platinum 200cc heads. comp cams XE268 cam, 1.5 roller rockers. Petronix Flamethrower II ignition, MSD wires. Timing is correct and vacuum gauge is rock steady. the problem is--i have to adjust the idle mixture screws every 4-5 days or so. when the problem begins the car doesn't want to idle on its own... dies when i come to a stop unless i powerbrake it to about 1,000 rpm. the car seems to do OK at idle if i take it out of gear., it will idle but even then it's a little skitish and the idle will fluctuate like its starving. every time it has done this i play around with the idle mixture screws giving it more gas every time. this always fixes the problem and the car runs perfect, i've done this about 4 times now. each time lasting 4-5 days like i said. i only have to adjust the idle mixture screw anywhere from 1/16'' - 1/8'' each time. it hasnt always been the same barrel each time. i'll adjust one..wait and if it doesnt work i turn it back until i get to the right one. and when i do it fixes the problem instantly. any ideas? with this kind of maintenance im thinking about going back to a holley!