[XJman]

I'm going to lean towards vacuum leak, or boost leak.

Some places of interest based off of my personal experiences. Ic to throttle body hose, turbo inlet, the airbox hose not mounted to the turbo inlet correctly, or not clamped shut, leaks around the tgvs, or a dirty maf sensor.

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[XJman]

Tumble generator valves. They sit between the plastic intake runner and the block. They are closed when cold to help better atomize the fuel into the air. They tend to leak around the gaskets and valves.

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