my '89 sc seems to blow black smoke at wot (or near it) this happens mostly when it starts up but also when it has been running for more than 30 minutes. heres the catch i haven't check my 02 sensors yet and a few months ago i had my cats gutted and resonator deleted. so the question is what are the characteristics of running rich and could the problem be solved with buying a new set of 02s and should i move the passenger side 02 to the same position that the 02 is on the driver side to counter the problem without having catalytic backpressure heat to give the sensors a good reading. thanks....please reply.