Okay so I was having sluggish acceleration so I did a tune-up on my 90 montero. No codes or light was on when I started. I replaced the oil, spark plugs and wires, fuel injectors (one was completely bad!), fuel filter and still no improvement. Now the check engine light is on throwing codes 11, 12, 13 and 25 (o2 sensor, mass airflow sensor, intake air sensor, and barometric pressure sensor) WTF?? I checked all wires and hose and everything is connected and hooked up right.

Could on of the fuel injectors I replaced be bad again and thus throwing all the sensors off? If not I don't see how all the sensors could go??? Electrical issue?

Please Help!!!

 

or maybe just bad o2 sensor???