HAVING TROUBLE WITH A 1989 JEEP CHEROKEE?

SO I PUT TWO NEW FUIEL INJECTOINJECT A 1989 JEEP CHEROKEE, MY CAR HAS A FAILURE WHEN I DRIVE IT TURNS OFF AND IT TROWS BLACK SMOKE, IT DOESNT HAVE THE SAME POWER LIKE BEFORE IT HAD THE OLD FUEL INJECTORS, CAN IT BE THE FUEL PUMP OR IS IT THE FUEL INJECTORS THAT ARE NOT WORKING PROPERLY