Injector misfire?

[SCIV]

OK -
Been running about a week & a half, put about 300 miles on her so far. Varied driving, 4,000 RPM max, no WOT yet. Everything is fine until today. Started missing and stumbling, P0200 code for injector misfire. Ran like crap.

Cleared codes via Interceptor guage. Tried to restart, it would fire but not catch. Did that like 5 times. Finally started, ran like crap. A/F ratio reading was 16 +. Drove it easy for a couple miles back to the office. P0200 code back again.

I don't think it is crap in the lines all the sudden like that. Fuel tank is at 1/2, has been full since new motor went in.

Need some troubleshooting ideas please fellas.

[ducky]

bad coil pack? Pull some plugs and start just getting the easy stuff out of the way

[SCIV]

bad coil pack? Pull some plugs and start just getting the easy stuff out of the way

I don't think so. If I clear the code, it runs fine for awhile.

[SCIV]

Update...
Cleared the codes, it runs fine, then goes back to P0200. A/F guage goes lean. Watched my O2s on bank 1 vs bank 2, bank 1 won't read above 100, bank 2 reads normal (bounces around from like 100 to 800).

Does it sound like a clogged/bad injector on the drivers side? How can I tell that?

Just seems wierd to start this after being fine since the restart.

[RedHeartbeat]

Sounds like a bad 02 sensor. Swap them around and see if the problem follows.

[SCIV]

fronts or rears?

[RedHeartbeat]

Fronts

[ducky]

Yeah thats what I had to do to mine. If you get anything kind of junk on them, like anything at all, they will go bad. I had that problem immediately when I did my swap. My bank 1 wasnt reading at all.

[SCIV]

I didn't pull them yet. I let it sit overnight and cold started it. Both O2s reading in the 900 range at idle at first. Then slowly dropped into the 800 range, then went normal bouncing from 50 to 800.

I gave it some throttle, and it was missing out. I think it must be an injector problem?

[ducky]

what size inj are you running now? If they are the same as your old ones, swap those on and see if it clears up?