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If you look at the left side of the plastic intake manifold, a bit to the rear of the throttle body you will find a metal tube coming off, it makes a 90 degree bend to the rear. Follow this tube to the rear of the left head, and you'll find the egr valve. It's not in a great spot. You'll have to lay on the engine to replace it, a drop light is a must.
The EGR tube comes into the left side of the valve. It has 2 8mm bolts that hold it on. I always use a 1/4" drive 8mm swivel socket and a 3" extension. Be careful when you get about done removing it, the gasket may fall and your new valve won't come with one. There's an alternate way to get the tube off also.
To remove the valve from the head you have to remove 2 13mm bolts. The bolts go straight down from the top. Don't bother looking for them, you have to feel for them.
The other thing you can do is remove the 2 bolts that hold the valve to the head and remove the valve and tube together. When you put it back together you have to leave the tube loose from the valve or you'll never get the bolts back in the valve-to-head joint.
After you're done replacing it disconnect the battery for a few minutes. This will clear out the false fuel adaptives that have been recorded in the engine controller's memory.