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Re: 1993 Chevy Lumina Service Engine Soon Light
It could be any one of fifty or sixty things, and it could be some combination of things. You can't know for sure until you connect a REAL scan tool to the diagnostic connector, and start reading out codes and data-stream information.
At that mileage, it wouldn't hurt to check the fuel pressure while you're at it.
When was the last time the engine got plugs and plug wires? Air filter? Fuel filter? Had the PCV checked?
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