Hesitation , loss of HP
 

1990 z32 na , ive had it for about 5 months now . Ive had times where it wouldnt start and times where it would run fine . Now it sounds like its misfiring and the oil pressure gets pretty low .

I believe its the 3rd coil pack connector or fuel injector , because when I pull out the connector on the 3rd cylinder theres no change in the engine .

Theres sometimes knocking in the engine when it decides to act up real bad and I really dont push it when its like that .

Did diagnostics , looked at the ECU and came up with these on mode II

14*: vehicle speed sensor circuit
34: detonation sensor circuit
51*: injector circuit

* indicates that the "Check Engine" light will come on under normal driving.

Any help would be appreciated , Im tired of driving my car like this .

Have you checked the ohms on the injector? Check the connections and see if they are corroded at all. You can also take a long screw driver and hold it to your ear while the car is running and you can hear the injectors "clicking" if they are opening. It sounds like the injector is dirty or you have a loose conection causing the injector to open intermittently cause a very lean mixture in that cylinder resulting in detonation.