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How about wrong maf sensor for the ECU?
Has it ever run correctly with that combo?
If the engine has good compression, correct ignition timing, and correct fuel quantity per cylinder event, then it will run right.
You hit the gas, what happens with the maf? The maf voltage spikes, the ECU responds by increasing fueling based on a non-linear map that is charted based on MAF voltage. If the maf sends the wrong voltage (incorrect maf, bad maf, airflow breach, bad wiring) then fueling will be wrong also.
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