hook an air compressor to the intake side of your turbo, turn the regulator to ~10psi and pressurize the system. Then start going ham with a spray bottle of soapy water on all vac hoses, couplers, connections, etc, looking for bubbles.
Test the resistance in your maf or try a known good one.
Get a wideband.
Backprobe and test the voltage on your TPS
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WTB SR20 *Non-Rep* Bottom Mount Manifold
WTB Bride Zieg II
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