I have a 95 t-bird v8 4.6l two door and it has been running rough latley i took it to the college that i go to and they say that my EGR valve is pluged and is the reason why my car is running rough. when i satart it up ther sounds like there is a nock in the moter and at a red light you can feel the car shake from it.

[hr]

they saythat there is a cylinder 4 miss fire is because of the EGR valve. is this rilly the reason why it runs rough?