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Sounds like you have a vac leak.
The CA isn't something you can plug in and read, it is not that advance of a ECU(OBD0). you can set the ECU into code mode and watch the flashing lights to monitor for fault codes.(sometimes you get lucky, but it rarely worked for me)
I would be doing a boost leak test, followed by checking my CAS and make sure it isn't pulling timing. The usual suspects state side are harness issues and vac issues, but being an OEM harness it shouldn't be a problem.
Ps your tune? it is a dyno rom tune? or just an off the shelf deal?
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