sounds like ur ICV man i had the same problem its located at the back of the plenum manifold on the left just rip the pipes out and block them up including the vacums then just adjust ur thottle body lever screws till u get it to the right rpm bout 650 is good mabey 750 make sure u adjust it when ur car is at cold start... 
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88 Supra
R154 Manual
1JZ Converstion Intercooled
Apexi Rampod
Hks TurboTimer
Blitz Nur Spec Zorst 3inch with hiflow cat to 4 inch cannon
Greddy Stage2 Elec Boost Controller 12psi...
Nxr 235/35/18s 245 on the back
Red Respray Black Bonnet
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