another question!!! my mustangs engine light comes on after driving a few miles, i hooked it up to the computer code reader, but it said everythig was normal. is there any other reasons it comes on? the cars a 1991 mustang lx 2.3L. another thing i noticed is the fuel pump located in the gas tank is always buzzing while the car is running, i'm guessing its normal for it to buz because its sucking gas to the motor, but i can hear it from in the drivers seat and really hear it standing at the back of the car, when i first bought it i dont remember it making that noise but i could be wrong! thanks!!!