Black smoke my 88 2L is blowing a lot of black smoke i have had the injecors done still blowing smoke

The pump needs setting up and timing adjusted.
If you fitted other than Ford injectors, that will also give issues of over fueling.

Diesel or gas

Hi. I suggest you fix the misfire first. Most likely an ht lead or coil.

if it takes 5-10 mins of running before black smoke disappear i think you could have broken rings causing engine oil into the combustion chamber. you could observe white smoke if you have just changed oil.
solution would be to replace piston rings. it would save u a lot if u could diy.

did the vehicle over heat after head gasket job , if so its possible it could have went again

Have you checked the heater plugs? if one is out it will be hard to start. Does it run sweet and clean when warmed up?

Black smoke tells me your piston rings are worn. Also the fumes you have explained tells me the valve seals are worn and leaking oil as well
The leaking valve seals and pistion rings will expell the fumes out through the exhaust. If you check your oil level every 50 miles and the oil level is down a half quart or more serious engine wear has occured and needs to be rebuilt soon

SOUNDS LIKE AN ECU PROBLEM IT IS COMMON WITH THAT MODEL

MASS AIRFLOW SENSOR THERE ABOUT £6O WHEN THEY PLAY UP THE CAR WONT IDLE PROPERLY AND POOR RUNNING/HESITATES BEFORE IT PICKS UP AGAIN, NOT SURE ON THE BLACK SMOKE THOUGH, GOOD LUCK .