Join Date: Nov 1999
Location: Central California, USA
Unplug the EGR valve actuator hose and see if it still does it. Unplugging the hose will cause some engine knock under higher throttle but for the test, ignore that.
I have seen bad EGR valves open way too much just off idle and kill the engine vaccum. They are supposed to only open slightly under low speed. carbon buildup inside the valve causes it to go bad. The stem of the valve is hollow.
Check my web page for First Gen Camaro suspension info:
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67 RS 327 original owner. 1965 Lola T-70