I'm trying to wake up my Alfa spider '84 (equiped with 2 solex carbs) and have some issues with the engine. It runs poorly and I have done some maintenace (changed the rubber mounts, vac.tubes etc) but it still runs badly. I have no respose when adjusting the idle mixture screws (regardless how much I turn, except when reaching the bottom). Only time I see some difference is when advancing/retarding the timing but then the engine will not start. Any ideas?