Unless some other issue has arisen.
Could be faulty gaped plugs
Incorrect plugs
Incorrect wires
When you say fuel system cleaning do you mean injector cleaning or from the fuel tank forward?
One other item to note:
Is this a flex fuel vehicle? if so have them make sure the sensor is reading the correct amount of ethanol being used.
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This reply was modified 3 years ago by
Richard Kirshy.