Car has rough idle, big loss of power, black smoke from exhaust, smokey smell of flooding

You are correct, black smoke means a lean mixture. The miss fire code solidifies this diagnostic. Most common cause: Clogged air filter. Check it first. If the filter is good, second step is MAF sensor and throttle position sensor. The fuel injector sensor is the next step. If after all that, it's still a problem, the fuel injection system itself could be bad. I.E bad injectors.

Black smoke usually indicates a rich mixture.

next.. check your sparkplug wires and ignition coil & module. one or two cylinders are not firing.

maybe yell at your gf for switching the 2 plug wires around ;) lol j/k. I'd start with checking the air filter...then make sure all your vacuum hoses are connected but, it sounds like ur exhaust converter is plugged...or maybe the ole' bananna in the tailpipe trick....run the car at night and see if the converter has a red glow..if so...converters plugged. I may joke around alot...but, I been working on cars for over 25 years

i changed the converter and new plugs new wiers new coil and now power and getting to much gas ,and the converter is red what wiill do next lit me know

maybe your injector is stuck open.. have u seen which cylinder haws the fuel on the sparkplug?

Now I have the same problem but could anyone help me out on this??? I got the car it runs fine the way it is now but they had to cut the wires to the forth injector and ran those injector wires to the third injector and it runs OK just a lil misfire but when I hook it up the right way it give it too much gas the car misfire I checked the voltage and it goes crazy. So I just need to know what that is. ??? ECU?? Or bad wire??

I have an 02 yukon xl blowing black smoke hard idle issues suckin gas down like crazy more than usual and i fixed it with an simple replacing the 02 sensors

Worn timing belt, rough idle, no engine code....... No power off idle.... Replace timing belt, and nylon/plastic belt adjusters.......