Stalling SR20det

[1eightySX]

Ok so about two weeks i posted a message about my car stalling. It is a redtop SR20DET from a 1991 180sx. So the problem is that it stalls under 2000 rpm, at first every one thought it might be a vacuum leak. I had that checked. Also, I changed my fuel pump thinking that was the problem but it did not help. So I took it to nissan, and they found when they removed the engine coolant temp sensor that it would run perfectly. So they put in a new 240sx sensor and it did the same thing. Do 180SX use different sensors than the usdm 240sx? What sensor should i be using?

Any help would be greatly appreciated, thanks.