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?
It means the computer is detecting a misfire on those cylinders, the most common cause is worn spark plugs or spark plug wires. I would recomend replaces both then clear the computer codes and see if the service engine light comes back on.
disconeect the battery for a few minutes that will reset the computer and remove the service light signal
An engine cylinder misfire has been detected
This happens when there is an Active Misfire, or a urgent pending service matter. Get your codes checked.
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try checking your 02 sensors
Normally a flashing check engine light means you have a misfire. Do not ignore this as an engine misfire will damage the O2 sensor and the catalytic converter which are very expensive to replace. Have this repaired immediately.