Is the car in the year range for using the Bosch biodegradable wiring? Mine are, and I have had to repair various intermittent problems with the fuel solenoid, GP circuit, altitude compensator circuit, etc. by running new wire.
You could try a temporary jumper wire from batt+ to solenoid when you are about to go for a drive that includes lots of opportunities for the problem to happen. If no problems, remove the jumper wire, test again without it, and compare.
My other thought was a small air leak into the fuel system, somehow small enough to create problems at idle but not able to affect higher RPM/load conditions.
What is the fuel filter condition?
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1985 744 gle d24t
1985 745 gle d24t
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