Leak can be almost anywhere, there is the smoke test but what I do is fix a piece of a tire tube over the air intake (turbo in my case) leaving the fill valve exposed so I can blow some air in with a compressor(3-4psi)use a spray with soap and water like trying to find a hole in a tire. Spray over throttle, IAC, vaccuums, intake manifold, break vac hose, etc. the iac might bubble some but it's normal, not on the flange though.
Pump Gas 385whp 319wtq
Race Gas 551whp 439wtq
Tuned by Fernando@RacingPartsSolution.com