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did you clamp all the hoses on intake manifold including ones under intake manifold. ??
If you ltft are big at idle and low rpm and get much smaller at mid/higher rpm, its likely you may have developed an intake or exhaust leak causing incorrect sensor readings.
Is the DI computer that sits under bonnet securely earthed via its mounting bolts
"He explained different things I could do to reset/recalibrate the tune with different driving patterns. Didn’t work though."
Im not surprised this did not work, unless you reflashed a tune with changed parameters, any resetting of ecu or changed driving techniques will not change anything, ecu continuously learns fueling and timing corrections
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