gonebroke240

Hello. I am running into problems with my 92 240sx.
The issue has been long a mystery. So I shall share.
I purchased a SR20det and the engine came with a t28 turbo. I have a front mount I.C.
Aftermarket FPR, down pipe, exhaust, and a Z32 MAF. The problem I run into is that when I start the car with one ecu that I have it starts and runs. Not the best though. There are plumes of grey smoke that come out of the exhaust, and when I give it gas black smoke comes roaring out. I have found out these forms of smoke are both flammable, my buddy knows not to smoke near the car again. Then when I purchased a new ecu. I slap it in and try to start the car. The car won't start with the purchased ecu all the time. If it does start, it runs very rough at idle like its running on two cylinders, the other ecu idles just fine. I am lost. I've taken it to a shop and they couldn't figure out the problem either