[supradaddy0803]

First thing that pops here is the cold start injector is running all the time making it rich (explains the black plugs). Or you have a vaccum leak somewhere. That would explain the black plugs and the miss. Check all of your hoses and then check the cold start injector. Probably not the injector but you never know. But even my 1JZ when it had a vaccumm leak ran like a biatch missing and dieing. When it was cold then it would crank and run fine but when it warmed up caput. Also check the hoses on the EGR because it doesnt open till the car is warm and if it is open all of the time then it will make it hard to start when it is warm.