will a dead o2 sensor make my 760 V6 pulsate when cold? it diden't seem to do this in the summer but now that it's not 95-100 deg when i start it up in the mornings it starts then it surges once like normal. then levles off for a few seconds then surges a Little bit agin, then agin but a little more and agin with a little more Like it's building up momentum or some thing, also could this be temp sensors? and where are they, i have found 2 sensors sorta under the air intake manafold, and the sensor that is near the heater core and the 2 upfront on the water pump, what are the ones that seem to be bolting in the engine under the manafold? there on the fire wall end of the engine.