fails for high HC's indicating a rich condition. Previously replaced the cat and o2 sensor (both were bad) O2 sensor threw a code. Valves have been adjusted to factory specs .007/.009mm. New air filter, fuel pressure is at 35psi. Bone stock motor with the exception of a carb legal DC header that came with the car, it has no cracks in it nor are there any or other leaks in the exhaust sytem. One thought I've considered is a possible map sensor, though I've never seen one fail without a code. any Ideas?