sounds kinda like a spark advance problem at revs that high. Or just your ignition timeing is off. check thse first and then tell us what you found. Just start with the easy things like plug wires, plugs. Also make sure the plugs wires arent arcing somewhere when the engine revs up all of these are possiblities. If it turns out to not be spark, have you replaced the fuel filter recently? Bad gas is possible but unlikely. Run the code and see if it has any codes stuck in it.
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1987 supra NA 5 speed
1JZGTE swap
Tokico Illumina 2 and Eibach springs
Tokico pillow blocks
Suspension Techniques front and rear sway bar
HKS super dragger cat-back exhaust plus test pipe
Greddy Profec B spec 2 boost controller
HKS type 1 turbo timer
Supra sport solid steel drive shaft
Walboro 255 fuel pump
JZA70 Front end mod
18" Volk Racing AV3 18x8.5 front 18x9.5 rear
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