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Intermittent problems are usually caused by bad power/ground connections. 

I know you said you’ve checked all grounds and harnesses.  How was that tested? Resistance testing? Or voltage drop testing?  Or just a visual inspection?
Resistance testing is not really accurate as older wires may show good continuity, but cannot carry current when the load is present.
A visual inspection is even worse with these older cars.
Voltage drop testing is key to finding these electrical gremlins.
I was forced to learn a LOT just for owning a Corrado

I will do more investigating on my grounds! I might just end up replacing them because I doubt they have ever been replaced.

Sent from my iPhone using Tapatalk

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