I just got my 87 turbo buick running again after sitting for two years in my driveway. Using direct scan i'm seeing my timing at idle jumping around between 17 deg. to about 21 deg. I am running an extender chip with 16 deg. timing at idle ( 91 pump gas ). The timing chain was replaced shortly before I stopped driving it and it was running great when i parked it. I have a factory service manual and thought it might be related to the esc module but the manual is pretty vauge on this subject. I'm thankful for any help I can get.