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Fix it or take it to a mechanic.

Possible causes are:

1. Faulty HEGO sensor.

2. Vacuum leak.

3. Faulty or contaminated MAF sensor.

4. Low fuel pressure.

5. Exhaust system leak.

6. Excessively unequal injector flow at any given duty cycle.

7. Cracked valve spring.

8. Oddball stuff such as restricted intake manifold or slightly leaking head gasket.

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