OK, since I've last chimed in....

I replaced the EGR Tube (not an easy job for a duffer like me) and a vac line that looked a little 'iffy'. Cleared the code and whamo, it came back after 2 trips in the car (1st one was < 5mi, 2nd trip when it came on was about 12 miles).

So then, out of desparation, I replaced the EGR valve, although my tests seemed to indicate it is OK.

I re-read the code and now I have a P0400 and P0411.

What next? I am at my wits end. Thanks for ANY help you can offer.

Matt