It does not open the GEO 97 TBI high

Good colleagues from the forum ... I have a small consultation.
I am repairing a 1997 GEO Metro and the minim stays well but when the maximum needs it runs out of gas.
What could it be?
I already changed coil, already verify the TPS, the minimum rear march body of the TBI, clean the TBI and verify that the injector opens well ... the only thing I lack is the computer ... ????

Did you try the injector in a test bench? You have that first to rule it as the culprit.