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This isn't a 'small question' IMO. Potentially difficult diagnosis.
Start with the factory service manual. DTC 76 is on page EC-157. Specifically this code means the AFR is too far out of wack for the lambda (oxygen sensor feedback) to compensate for. It unfortunately doesn't specify too lean or too rich. How does it run? Smooth or rough? Smell like gas?
FSM gives a summary of potential causes:
- Intake air leak
- Bad front oxygen sensor
- Bad injector
- Exhaust leak (at the manifold)
- Fuel pressure problem (weak pump, bad regulator)
- Low fuel
- Bad MAF
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