CTS problems

well i installed my new 02 sensor seems to get better gas mileage. My A/F gauge still reads rich, but not as bad like .98v instead of 1.05v. i know this isnt very accurate. the car runs shitty when its cold, feels like fuel cut, then when its warm it still does it but, its just a litttle miss not as bad, and my coolant light flickers at high rpm when i shift. My question is could it be the coolant temp sensor?, i know this is like a choke for the car when its cold. the temp gauge in the car works fine. i drove it the other day and i noticed the A/F gauge wasnt moving it was stuck at like .09v so i poped the hood and the CTS sensor was unpluged so i pluged it back in and the gauge started jumping around like normal. i have another one off of my totaled car, is it worth a try. ive been messing with this miss for a month now, its got to be something electrical.

well i intsalled the coolant sensor from my old car, i noticed the A/F drop to .92.93 where it should be, but now the car has a hard start. it turns over i little longer than before. it also bogs down. is this that sensor or something else?