It was running pretty smoothly then started chugging on the last test drive. I had a rough pull-out on a slight incline and almost stalled it (learning how to drive a standard trans and especially on this car isn't easy lol) after, chugging. Barely made it home. Noticed air in my add on in line fuel filter (pretty sure it's a K&N glass tube with replaceable filter) by carb. I think it's sucking air into the fuel line. Tightened the ends of the filter Idles ok ish, but driving, can barely give it gas or it chugs itself out, sputtering, lurching.