1995 Subaru Impreza Sedan - Rough idle - what next?

Rough idle and engine light is on. I went to the store it was running fine, I got back in and the engine light was on and it runs rough now. It has 102000 miles on it. I changed the coil plugs and wires already.

Until you get the stored trouble codes “read”, there are a few possibilities.
The exact OBD codes can allow us to try to narrow-down the possibilities.

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