Hey all, been a minute, having some issues I’m hoping you all might be all to help with. So first a little backstory before we get to the current codes. Recently I was throwing a P0139 every day for a week before I could check into it. I’ve been getting it at random here and there ever since having done my cattless pipe but not to this extent. I thought I figured it out as a muffler shop had put the wrong size gasket on when I had my resonator cut. I was driving without the code for a full week, thought I was good. Then, this morning I started my car up and after it settled down my CEL was on so I turned it off and figured I was gonna see the P0139 and it was the P0300-0301-0303-0304 mentioned in the title... I haven’t driven the car since and I’m trying to weigh my options since I’m modded like crazy and don’t trust dealerships. My father has me thinking it could be bad gas since the night before I filled up at a station I don’t typically use. What does everyone think? What should I try? I’m worried...