Ever since i've had the car i've had this problem. I've replaced the plugs wires coil o2 sensors basically everything except the opti and I can't seem to figure out whats wrong. At about 180 degree's there a very noticable loss in power. I realize when an engine is colder it makes more power but this is very bad. I've tried disconnecting the o2's to see if that makes any difference but it didn't seem to change anything. Any ideas?