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Try isolating the cause to either Fuel or Ignition, as follows...
The next time it stalls, be ready to quickly connect a jumper wire from the Fuse 6 feed contact (left side) to the Fuse 4 feed contact. (Fuses 6 thru 10 are always live, #6 is just a handy voltage source. The Fuse 4 contact feeds both pumps.)
The pumps will run immediately. Try starting before it cools off.
If it starts, the ignition is OK, and the jumper wire bypassed a fuel problem. (it effectively puts battery voltage straight to both pumps, eliminating 25 amp fuse and Fuel Relay) FI ECU working OK.
If it doesn't start, suspect RPM sender, Ignition Power Stage amplifier or wiring. Maybe even the Coil, but not likely.
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Bruce Young '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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