built sr with nistune running dog rich.

[s13_silvia_redtop]

ok so i have a built sr with nistune as my tuning software. im about to hook up my wideband but i know its running rich bc it backfires and bogs down a lot. the other night was the first time it ran good since the built I.E. actually drove it, and then a couple days later it runs like dog s***. it seems like the coolent temp sensor is reading cold and dumping in unneccesary amounts of fuel but i can read on nistune that its not reading cold? does any one have an idea of what it could be? it seems like a wiring issue but i have gone through so many wiring trouble shooting and just cant figure this one out need help! lol