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You never said if it starts with the AMM unplugged?
Did the ECU's changed have the same part numbers?
You might measure the current draw of Fuses 1 and 11
and see if the fuel relay (and ICU controller) is behaving.
See here for the nifty HF unit that measures current in a fused circuit:
https://www.brickboard.com/RWD/volvo/1685010/940/960/980/V90/S90/review_harbor_freight_30a_fuse_circuit_tester_67724.html
or use your VOM to measure DC millivolts across the top legs of the
ATC fuses 1 & 11
and derive current draw from the chart:

the complete chart is here:
https://m.roadkillcustoms.com/wp-content/technical-pdf/Standard%20ATC%20Fuse%20Voltage%20Drop%20Chart.pdf
Happy hunting, Bill
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