1992, 3.3L, ECM goes every 15 days

I have problems with the ECM, the engine runs Ok until it stalls, the problem is the ECM, I bought one from a wrecker and worked well for 15 days and the problem came back, I bought another and it was Ok for another couple of weeks and now I have the same problem.
Does somebody knows what can be causing this?

Sounds like a short in the wireing harnes. any crimped wires?

Thank you, yes it was a wire (red) that was melted and no copper in it, I replaced that wire and dont know if the other are damaged

Just keep an eye on it, look for any more melting. I glad your car is working better. Im also glad that i could help you. If you have any more questions, let me know.