Did you do other work on th engine before it sat? Im interested if any of the conrods have been off.The one which if misplaced will give you your cars symptoms.A misplaced conrod on the cruise control would give you this issue.It will make the bowden cable extend out further than orig. its a very easy misjudgment since both rod placements are less than an inch apart.Alot of 617 motors have a disassembled cruise control and leave this open rod placement to get misplaced as apart of the throttle run and bowden cable managment rods .Trace it ,maybe your problem in a bottle.