I was thinking the same thing.That's def why it's not running right. No O2 means no info to adjust fuel trims, pretty sure it will just run at 100% all the time.
Yeah, I think an o2 sensor is a good place to start and should make a difference. .Tow it to get it tuned properly. That is my recommendation, especially if you have no primary o2. Also, what do you have her timed at and how did you set your timing?
Dlo, you should make a vtec solenoid cover as well. That way your artwork wouldn't get covered up.