I'm having the same sort of problem, car won't idle, misfires, heaps of black smoke. I haven't even tried to drive it, won't hold revs. The day before i took the coil packs out and taped them up, to fix a miss at boost, which it did fix. gave it a bit of a hiding and the next day it wouldn't run. just put a brand new set of yellow jackets in there, changed plugged, can't find any cooler leaks or vaccuum leaks. cleaned the maf
just about ready to try get it towed to a mechanic