Issues with 1992 Sonata V6 GLE 3.0L (Check Engine Light... Sudden Power Loss)

Hi Everyone,
I have a 92 Hyundai Sonata V6 GLE 3.0L and basically have had this annoying issue for almost a year. I've taken the car to numerous repair outlets, had
a Catalytic Convertor replaced for no change/difference whatsoever.
Basically what happens...
Can be driving at Cruising Speed on a Highway/Road, or going slowly around a Roundabout and the Car Loses All Engine Power. Dials Report 0 RPM and the Check Engine Light is immediately illuminated.
Most of the time, the Power is Restored within 1-2 Seconds. Sometimes the Car Stalls and Requires Restarting (Usually only when travelling slowly)
As you can imagine, this makes driving quite unsafe.
Although it is a 92 Car, it has only completed around 90-100,000 kms.
If anyone has any ideas, I would be greatly appreciative.
Kind Regards Heath Burchfield Melbourne, Australia
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As long as electrical power is maintained, I'd primarily suspect the optical sensor in the distributor. You'll find that an expensive prospect, however, and it could also be a harness issue-- I've seen cases of broken wiring inside the harness where wierd things occur when the harness flexes-- or a power transistor issue.
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I forgot to ask. Are any codes stored? The check engine lamp is a sign that the ECM lost power and regained it. If you've got no codes, that could very well be the issue. In that case, maybe just replace the ECM relay and see if the problem goes away.
On the other hand, if you've got trouble codes, start with them.
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