95 geo tracker 1.6 16 valve 96 motor with 95 distributor. I got a code 23 and 34. Got the 34 taken care of but still code 23. I have cleaned all the grounds and both battery terminals. I have also tested the tps and readjusted to specs. The coil tested good i also done the egr valve test  seemed ok. New plugs wires cap and rotor. Timing is good 8btdc rotor button is pointing at number 1 on cap. New fuel filter. Please help I'm lost at this point.  180 psi on cylinder 1 2 4 cylinder 3 170psi. Injector ohm test out to be 13.8 ohms to 14.0 ohms