Be more specific with details- with load, with no load, does not matter what load, etc, does it die? does it stumble? does it slowly lose power?
Without that information it could range of just about everything from a restricted/plugged exhaust to inadequate fuel pressure, and then some.
You could try backflushing the Mass Aie Flow sensor with contact cleaner as well as the TPS. And start it up at night in the dark and look for arcing of ignition components.
If no codes have tripped yet, this might address the issues prior to an error code being logged.
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