1999 Ford Mustang - Help with issues

I have a ford mustang 1999 body with a 1996 motor 3.8 v6.and has a 2001 computer brain the car is rough starting spits pops backfires and slow at exceleration and takeoff then slowly runs like a bat out of hell once you come to stop runs like crap and all over again. Please tell me what else can I do to solve this problem

I can’t diagnose this Frankenstein of a Mustang over the internet. Maybe not even in person. You have a mess on your hands.

Agree with Mustangman, but my gut feeling is the engine/computer mismatch.

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