I am aware that the air/fuel gauge keeps rocking back and fourth (lean to rich) while on partial throttle and stays steady on full throttle.
What I am not sure of is when I first start the car-The gauge stays on lean for about 20 seconds and than slowly(real slow) climbs up to rich (about a minute), than it starts to rock back and fourth. It does the same thing everytime I start the car, doesnt matter if it is cold or warm. (I can drive for 1/2 an hour, shut it off and start it again, and it does the same thing). Is this normal?
I have a 96 GsR, if that matters. thanx

 

thats the o2 sensor heating up