94 duster driving me crazy!

I have a 94 duster 3.0. The check engine light went on and the code came up as the o2 sensor. I replaced it and the light went away. Two days later it came on again, now giving the code 27, injector control circuit. In the morning the light is off, after about 20 minutes of driving it comes on again. When it does, it idles/runs a little rough. It never dies. I'm running some injector cleaner through it in hopes it will help. Any suggestions or tips would be apperciated. The light is driving me crazy!
Thanks

Reset your computer by unhooking your battery for 20 mins. Hook it back up and then see.