I had a similar issue and chased it for a month. Finally after talking with the guys on CHR started with the tank and started pulling things and checking them out. Got to the fuel filter (12 months old) and found that it rattled. It had come apart internally and dumped all the trash down the carb ,a Holley, and cloged the idle circuit. Rebuilt it and all was fine. Also make sure you have a good fuel pressure regulator and gage. Its very easy to mess the floats up with high pressure from the fuel pump. Your truck is awesome and I know it is frustrating having it sit there not being able to drive it. Been there done that!