code p0303

Hello, I have a 2002 Mazda Protege5 (119k miles) with a low idle and a code for Cylinder Misfire #3 (P0303) Now I'll start with this, 3 weeks ago I was driving home from work and my CEL came on. I took it to advance auto right away and discovered 3 issues. P1250 - Fuel Pressure Regulator P1250...