hey my non turbo supra is running rich and has a rough idle. Would the problem be the coolant sensor or the oxygen sensor?

probably the oyxgen sensor....either that or its your maf

its always good to make sure the throttle bodies are clean, as this was the same case for a friend of mine.its still not perfect but it may need a ecu remapping. in your case im not to sure but i felt it would help giving my account of it. ;)