That ECU could probably be the issue or related in some way, as well as the mods since you said it was "heavily modded". But first things first, are there any error codes that come up? And does this problem happen when you rev in neutral as well?
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1989 Toyota Supra Turbo w/ Targa Top
White Exterior-Blue Interior
3" Blitz Catback Exhaust System
BIC Divorced Downpipe, Straight Pipe
Megan Track Coilovers
Apexi BOV, Turbo Timer, and Intake
Lexus Projector Fogs
Bride Low Max Replica
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