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Im not sure what ecu is in there right now but i do have both the obI and OBII. Which one should go in there?

So i bought a 99 civic ex with a b16a2 engine swap. I am having a lot of electrical problems and was wondering what i need to look for and steps in fixing it. All that i really know is that its not idleing right. It will run but i have to keep my foot on the gas otherwise it will die. Also the...