A stuck-open runner will disrupt the carefully engineered airflow into the engine's cylinders. This will likely lead to:
* Poor fuel economy: The engine will run inefficiently, burning more fuel for less power.
* Rough idle and running: The engine's timing and fuel delivery will be significantly off, causing rough operation and potentially stalling.
* Reduced power: The engine will lack power, especially at certain RPM ranges.
* Misfires: An imbalance in the air-fuel mixture can lead to misfires, potentially damaging the catalytic converter.
* Check engine light: This will almost certainly illuminate, indicating a problem with the engine's performance.
Driving with a stuck-open runner could cause further damage to the engine over time. It's best to have the intake manifold inspected and repaired by a qualified mechanic as soon as possible.
