We'll start with the run down on the car. Its a 89 Crx si with a 99 gsr engine all converted over to OBD1. I got my 3" exhaust done to it yesterday (boosting in a couple weeks) No o2 sensor currently in the car. Has a Walbro 255 in tank (less than 2k miles on it) and have never run anything other than Chevron premium gas.

The car starts to cut out and bog down in the mid to high rpms.

Any help would be appreciated.
Thanks in advance H-T. Robert.

 

One possible symptom for a Code 43 is an o2 sensor problem. Since you mention you don't actually use one currently, that sounds like a likely cause for the CEL.

 

But what I'm not understanding is why it's acting up now when it was driving fine all day yesterday and all day today up till around 6ish or so. Seems like its running out of fuel with the way it's running but I know its running way rich due to the o2 not being in the car. Could a faulty/clogged injector cause that code? Or maybe my fuel filter?