1. Could be faulty oxygen sensor that screws up your air-fuel ratio readings.
2. If you have replacement ECU or piggy-back installed and you have put in new tuning bits, could be the settings/mappings need to be checked
Hi Guys, just wanted to find out, am planning to sell my car, a 03/08 roadster, what would you think a fair valuation would be for it. Low mileage, standard no mods, good condition. I'm getting some very poor offers...