Dakota (still)

Friend has a 88 Dakota v6, auto, 165k, 4x4, -- nice truck.
Recently started setting code 13, only.
Today - Replaced MAP sensor, and no improvement.
Checked for vacumn leaks, and replaced a couple of hoses... treated intake with seafoam cleared codes
It runs rough at idle, dies, ac works, but doesnt miss, etc.
Ran about 2 minutes and set codes.
Other suggestions are PCM?
Anyone have any help and great ideas on this?
replaced all vacumn lines!
Thank you
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