what is the condition of the wires connected to the cam position sensor ?
wires on 20+ year old supras get dried out and brittle
if you had a cold start injector issue it would still start but it wouldn't start on the first attempt maybe the second or third
it would be interesting to check if you are getting spark to the plugs when it won't start .
i had an issue like this and it was related to mangled wires going to the CPS
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