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this suggests a fault with the engine control computer or one of the sensors feeding it. Common things that can cause this would be a bad airflow sensor or fuel pressure issue.
if you are not getting a warning light, then this usually means there is no faults stored in the car's memory
in this case, to identify the underlying cause, you will need to have real time diagnostics carried out while the issue is presenting itself. With the proper equipment hooked up, all inputs/outputs from the engine management system can be monitored in real time, and manual checks made as well.
this will be the only way to verify the cause without starting to replace parts randomly. This is how I would advise you proceed in this case.
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