[brcidd]

my '94 "w" engine astro will get like that periodically- and I can tell it has a piece of carbon stuck in the egr valve seat- I pull out my scan tool and check egr pintle position- it is usually 25-50% when the requested position is 0%-- Then I exercise the egr valve to 100%- while holding up the rpms to keep it running- and the chip gets blown out of the seat- and is able to seal properly. I know it is a chip because the first 2 or so times this happened- I pulled out the egr valve and saw it- then cleaned it , then it was okay- but the scan tool output option is much easier and faster. But mine usually set the service engine soon light- good old code 35 or is it 32? I forget......