how to program my Engine computer after i replace it with a new 1..

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My Engine computer went out on me when i was driven at first i didnt know what the problem was i tryed to get a computer reading on it and it would not read.so i bought a used Engine computer to replace the old one and now i need to know how to program the new 1 it came from the same make and model 1 that i have your help would be gratefully appreciated thank u