Have you pulled the OBD2 codes lately....? There are so many things connected to the computer & regulated by it that you could be swapping parts, service & time but never really controlling/directing the ECM as it 'SEEs' it's self.
After all computers (ECM) tend to have a 'mind' of their own...if you don't know how they are programmed....
Just my experience as a DIY'er...
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