Fuel pump relay
Crank position sensor
Radio suppression relay
...should all be checked and or replaced.
You can re-flow the solder joints in the suppression relay. Inspect with a magnifying glass first for cracked solder joints. -- free
Wiggle the crank sensor wiring while the car is running (especially down by the bell housing) If it stalls that's the problem. If the sheath on the cable is cracked or compromised at all it should be replaced.
Cleaning ground points is -- free.
Remove, clean contacts and replace all of the fuses -- free
Spook's other suggestions like ground points and power stage are also likely culprits.
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'90 245 290k, '93 945 297k
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