Can a incorrect engine timing cause to rev up 5000RPM?

Yes, incorrect engine timing can cause an engine to rev up to 5000RPM. Ignition timing refers to the timing of when the spark plug fires in a gasoline engine. If the timing is not correct, the engine may not be able to fully combust the fuel, which can lead to problems such as power loss, rough idling, and increased emissions. In some cases, incorrect timing can also cause an engine to rev up uncontrollably, which can damage the engine. This can happen when the timing is set too far advanced, or when the timing belt or chain is skipped or broken.