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Mikester is correct, check for vacuum leaks.
Also if the TPS voltage is off its possible that is what caused your flat spot before so check the tps voltage.
I dont know if the Silvia came with the shorter throttle cable like the s13's had here in the states, but make sure with the new manifold its not pulling the cable at all.
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Z32 with lq4 swap
Desert Street Scene || Dssevents.com
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