Just learned another newbie lesson
Spark is not the same as good spark. Distributor seems to be it! Ordered a new cap and rotor (couldn´t find it locally), but they were out of stock. So while waiting, I cleaned the old one and scuffed contact points. MUCH better! Went for a 30 min drive, only had a few backfires. Hopefully they´ll be all gone when I get the new cap and rotor. *fingerscrossed*
Should I have my mixture checked after getting propper spark? Will it be altered? It was adjusted correctly while I had the backfires, as an attempt to fix it...