Man does time fly, still have the ?83 Delorean. It sets often but I keep the fuel changed and run it when I get a chance. Ive noticed lately that the exhaust smells rich, even though my CO dwell reading is still between 30-50 when at operating temp. Its actually smelled that way for a few years or better but as long as it starts and I made it to some local car shows I didnt mind much. Now that Im not so busy, Im wondering if it could be a bad O2 sensor or if there are other things I should look at such as fuel pressure. It doesnt seem to purr like it did back in the early 90?s. Anyone have any advice?