[diamico1]

I have a '95 Grand Am se with a 3.1 in it. i've had to 2 mechanics look at it and they can't figure out why at 53mph and above the car runs bad ,shakes,misses and pulsates. They gave it a tune-up, changed the coil, new EGR valve, they even tried a new computer.
The only diag code that comes up is that #2EGR valve is not operating. I have no clue on what is wrong, could it be exhaust (converter),fuel pump, a sensor? It also seems to miss at stop lights or when slowing down to stop. The car runs great inner city driving, no problems what so ever. The check engine light comes on when I drive on the freeway but not right away. i bought the car with this problem, the dealer and I thought it was just in need of a tune-up. They are more then willing to fix it for free but can't figure it out what it is. They even had the tranny looked at.
Also can anyone tell me where i can find interior parts like a cluster, but not the guages just the plastic piece to cover them.
Any help would be greatly appreciated. This is driving me nuts!!