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Help diagnosing rough running Festiva

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  • Help diagnosing rough running Festiva

    My 91 fuel injected has been running rough for a few months. Mostly dipping RPMs at idle and during coasting I bit of roughness as well. Never stalls, just a bit rough.

    Pulled the spark plugs and the tip was completely gone on cyl # 3. It was basically disintegrated. I think I heard it happen too.

    Put in all new plugs and new wires. No improvement. Checked the #3 plug after a week and it was already black. The others looked fine.

    I am thinking too much fuel since it's black so soon... maybe a leaky injector? Is that common?

    Any other ideas?

    Thanks!
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