poor performance

Hi All, I have a 1968 Mustang Convertible, 6 cylinder 200ci with automatic transmission. I did the 5 lug conversion with front disc brakes and the rear-end is from a 1967 mustang with 9" drum brakes. When I drive the car it's sluggish and the gas mileage is bad, maybe 10mpg. When I hit on...

Hello I have a 2001 v6 Mustang. The "check fuel cap" light has mostly been on, off, and on for about 6 months. There's a leak where the fuel tank meets the fuel line used to pump gas into the tank. A Ford tech cleared the code, and the light remained off for months. About 3 months ago, the...