Since it cuts out when the engine gets warm I'm more inclined to believe you may have a problem with your igniter. You should check to see if you're getting spark next time it cuts out with an inline spark tester.
This could also explain why it fires once the engine has cooled down, since several times faulty igniters start having issues in extreme temps (hot or cold)
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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