Thanks for your reply brent.

.. i figured that it would ruin my gas mileage because a friend of mine actually had the same thing happen to him. His headers were leaking, went to fix it and his gas mileage and throttle response was significantly increased.

Wouldnt that be correct though? A leak in the headers / manifold would create air flow outside of the exhaust. kind of like running open headers. You'd burn more gas because there is no back pressure going back into the engine. Right? Well i could be wrong. But i definately want to fix my gas mileage. If you get 10-12mph, theres definately something wrong with my car.

- Fuel filter changed
- New spark plugs
- Spark plug wires
- Serviced engine recently

What else am i doing wrong?

The only thing i havent fixed or changed is my manifold leak, and im hoping that is the reason why im suffering horrible gas mileage.