1999 Monte Carlo 3.1 130,000 miles on car.

Service engine soon light came on around 3 months ago. I changed spark
plugs with no change. Knowing that it was going to throw an ERG valve
code I took it into the car place and sure enough, EGR was reported.
Left the car at the shop over my vacation week. They replaced the EGR
valve.Picked it up on the way home. Light came back on before I got
the car home. Drove it for 4 days and nothing has changed. As a matter
of fact the light came on at start the second time i started it rather
than one to two minute into the drive.

This afternoon I took it back in to be scanned. THIS TIME I leaned
over his sholder to block out the sun I saw a 401 code and he said
it was inceficient flow. "may be the egr tunnel is clogged in the
manafold" or "maybe it's the cat plugged up". Or "maybe it's the
computer" ching ching, ching ching......

I plan to take the EGR off tonight and look around. Any helpful hints
would be appreciated.

Air filter has been knocked off clean and never replaced. Have new one
on the counter for tonight. @ 80,000 miles I was lucky enough to have
the $400.00 intake gaskets go. They were the ones that did the job.
Think any sealent has leaked? That job was done @80k and the SES light
came on around 120k.

Up against an inspection deadline or will be subject to a fine. It
won't pass with the SES light on.

Thanks for any help.

cw