I have a 350 with 730 ecm and stealth ram intake. I can drive the car and it will warm up and go to closed loop. As long as I have my foot on the gas it stays in closed loop, but when I let it idle for a few seconds it goes to open loop and then it starts to act crazy. Is my O2 sensor bad, or is something else going wrong?

 

Could be the O2, replace it with a heated one.

If you can scan the car its easier to see why its going out of CL.

 

I have a datamaster log or two where it does it. I'm not sure how to post that though.

 

Do you have a heated or non heated O2? How far from the head is it if its non heated?

 

It's Non Heated, and it's in the header. It's a shorty where all of the tubes ome together.

 

Its definatly cooling off causing it to go into OL.
Get a 3 or 4 wire heated unit and you'll be fine.
I run mine off the Fuel pump relay for the heater power.
Be sure to make the adjustment to the bin so the PW is corrected by battery power so any voltage drop caused by the heater does not influence the PW.
Address 8016, bit 6 should be un-checked in the $8D mask.