2000 Lumina 3.1L EGR error

[cnatsu1]

I've been battling an EGR error on my wife's car (2000 Lumina). The man I bought it from had replaced the EGR to no effect. I've had the EGR off a couple of times myself and cleaned out everything the best I could using some wire and aerosol seafoam deep creep which my mechanic friend recommended. Tonight I ran a pint of regular liquid seafoam through the vacuum line off the pcv valve and in the process found a crack in the pcv elbow. Could this crack could be the cause of my problem?? Off to the junkyard or dealer tomorrow...

I see lots of postings saying to clean the carbon buildup but most are pretty vague as to what needs to be cleaned.

[maxwedge]

Any unmetered air entering the engine can skew the egr feed back inputs to pcm.