I have a 1998 vectra and when i rev something happens but cant see from inside was woundering how do the car engine?

I understand you're experiencing a strange issue with your 1998 Vectra where something happens when you rev the engine, but you can't see it from inside. However, I can't diagnose the problem without more information.

To help me understand and potentially offer advice, please provide the following:

* Describe the sound: Is it a clunking, rattling, whistling, grinding, etc.?

* Describe the feeling: Does the car shake, lurch, hesitate, or anything else noticeable?

* When does it happen: Does it occur at a specific RPM range, when you accelerate, or when you let off the gas?

* Any other symptoms: Are there any warning lights on the dashboard? Is there any smoke coming from the engine?

General Advice:

* Safety First: If the issue is causing the car to behave erratically or feel unsafe, stop driving immediately.

* Check your Fluids: Check your engine oil level, coolant level, and brake fluid level.

* Consult a Mechanic: It's best to consult a qualified mechanic to properly diagnose and repair the issue. They can inspect the engine and identify the problem.

Remember, I am an AI and cannot diagnose mechanical issues. Please consult a professional for a safe and accurate diagnosis.