I would be suspicious of the ignition module.Mine had same problem I replaced the plug wires and now all better. I had #2 cylinder misfire reporting on 1998 Ford Escort ZX2. I noted that I could force SES light to flash at high RPM also. (Flashing light indicates misfire in progress. Serious for engine.) Replacement of plugs and wires resolved the issue. This was well overdue, and plugs showed burn damage to electrodes. It also could be your fuel injectors going out. Id change plugs and wires first, and see if it helps. Does it always come on only when you get to 50? Or does it come on when you accelerate, say, going uphill?
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