By adding fuel he means that when the TPS reads 0 percent on a rev fall down the fuel injectors stop functioning to save some gas. They usually kick back on ~ 1400 rpm so it doesn't bottom out and die. Since a light weight flywheel will lose RPM faster, you need to kick the fuel back on at a higher RPM so it can catch it and let it idle.
Kick on the injectors sooner and increase idle to ~900.
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