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3.4's with throw those egr codes regardless if the things is brand new or old as dirt. Any time I decerlerate and coast that code gets thrown and ive spoken with several 3.4 owners whom all have the same problem. doubt its you egr.
I had everyone of those codes, same exact ones, thrown at the same time a few months back. started replacing everything from egr, tps, all three coils, plugs, wires, iac, 24 and 3x sensors, seafoamed it and cleaned tb, and a few other things and was still haveing a horrible missfire so bad it would stall under load, and got worth when the car got hot - even got hot quicker than normal just in park in my driveway.
Took it to two different places cause I was stumped. Some thought I had a vac leak but smoke test showed nothing. One guy thought i had my egr on backwards, idiot. Ended up being a clogged cat for me. Here's the funny thing though that cat looked great when they cut it out and my exhaust guy looked at me a laughed saying he told me so. but when he put the new on in and we went for a ride - it was perfect no missfire, no stalling out. nota.
not saying thats your problem but that was my trouble with my little 3.4
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