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For S14 motors: Are you sure VVT is turning 'on' do you hear the solenoid click when you touch the throttle (move the throttle blade by hand from the engine bay). Also you can try disconnecting the VVT solenoid and see if the engine behaves better.
I Once had a set of 272HKS cams and the engine would run much better with VVT turned OFF all the time. I put a switch on it though because if you leave it off indefinitely it eventually drains of oil and sounds like a rod knock. So it was necessary to run the vvt once in a while.
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