The EGR valve does not open at idle speed so there is no difference in adjusting idle speed. The manual says to disconnect the line to the EGR and the vapor canister. When I worked on these cars at the Chevy garage we never disconected either line.Not just me but no one that worked there. Never had a problem. AS to the low idle 70 Nova has it right, the solonid is "on" any time the key is on run. (some cars are only on when the A/C is turned on) There is a low idle setting so the car will run if the gas pedal is not touched when starting. On my own car the engine won't run at "low" idle. I haven't really tried to set it yet to see what would happen. Jay 6155
