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An intake duct that collapses under the vacuum of full throttle. The duct is clear at rest and closes when it matters, which is why this survives every inspection on a stationary engine — the fault only exists under load.

The symptom is a severe power limit at full throttle with a normal idle, and airflow falling far short of what the module expects. Perished, softened or previously kinked ducting is the cause, along with a duct that has lost its internal support ring. Watch the duct while the engine is revved under load, or check for a restriction upstream — a heavily blocked air filter creates the vacuum that collapses a marginal duct, so the two often arrive together and replacing only the duct leaves the cause.