INJECTOR NOT PULSING!!!!

Im about to throw in the towel with my 3.4 96 4runner after putting some money into it to get it running it won't because some of the injectors just dont pulse, And I can't figure out why. any help would definitely be appreciated.

 

Fuel injectors may fail to pulse due to electrical, mechanical, or computer-related issues. Common causes include faulty wiring, blown fuses, a bad fuel injector driver, a faulty crankshaft position sensor, or a problem with the Engine Control Unit (ECU). Low fuel pressure, airlocks in the fuel lines, or a bad fuel pump can also prevent injectors from firing.

 

The injector plugs do get power and the grounds are not broken from what I can see, I replaced the fuses, i dont have any fault codes for the sensor, i suspect It could be the ecu but at this point I cant justify spending that kind of money for the hope that it fixes a 30 year old car.