88 Mustang stalling....help!

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What computer did it come with? Mine idled rough for the first few hot cold cycles then it smoothed out.

What did you use to make your wiring connections/splices?

How does it run when warmed up?
88 stalling mustang

A9L is the computer that I put in it, the one that was in it, not sure. I soldered all the connections. It has stock injectors and throttle body. After warming up it runs fine but it has a backfire at lower rpms when I give it gas sometimes. I'm not sure what else to do with it any ideas?