I got a early 99 7.3 took the guys from a 02 and put in the 99 now truck is not building no boost and dumping black smoke the intercooler boots are good turbo is good vacuum lines are good what could it be?????
You need to look for leaks. It could be a misalignment at the up pipes connector, something loose in the Y pipe up front, somewhere you either aren't building boost or you're losing it. You can build a boost leak detector fairly easily with some parts from the plumbing aisle at Home Depot.