Had a scan and get report of EGR system problem. Been told this like two times in 2-3 years with intermittent CEL light. About carbon, no carbon on the new valve, naturally what is the place to worry about carbon on, in the system when and after getting the old one off. Read things still have to wonder were this carbon would be and what to do about it. Going to replace the control solenoid as well, managed to get AC Delco parts. Seems simple enough to remove and replace both of them but would like to understand the possible carbon issues I see written about from time to time. And what is done about it beside scrape it away if I see some. Were would it be if I have it Any input would be very helpful. 1994 LT1 152,000 on machine. BTW runs perfect at all times CEL on or not code was # 32, lamp always goes away after restart only pattern I have seen is comes on approaching a stop, or going rater slow and about to stop, as weird as that sounds. Been on 5-8 more times or more no pattern no time frame. All hoses look like new, and are in place and no cracks or any of that. I feel it is more a solenoid problem , but have not tried to see if it will hold a vacuum considering age and miles I do not mind replacing it either way.
Just do not understand the carbon things I read unless it is in the valve and not letting it close sometimes.