What is the most likely cause if the engine starts to fail or stutter when running at high RPM?

Question

DentroTest · Accepted Answer

The correct answer is a dirty air filter. Engine operation depends on a balanced mixture of air and fuel. At high RPM, the engine needs to intake a large volume of air very quickly to maintain power. If the air filter is clogged with dirt, it restricts oxygen flow, causing the mixture to become excessively rich (too much fuel, too little air). This leads to engine choking, black smoke, and power loss. The other options, such as lack of fuel or water in the fuel, would typically cause issues across the entire RPM range or prevent starting, rather than being a specific symptom of high air demand.

What is the most likely cause if the engine starts to fail or stutter when running at high RPM?

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