Hey Everyone, I have 2009 WRX running an AEM CAI with Accessport Stage 1+ tune. I was on holidays and fueled up at gas station in a small town, I was a little apprehensive about the 91 octane seeing as it probably doesnt get much use, but I needed gas. I got back onto the highway, sped up to merge and the CEL comes on. Thought ****!! Bad gas, gas cap not tightened? Checked the code on my AP and it read PO304 PO303 PO302 and PFFFE. I tightened the gas cap reset the ecu and drove home, roughly 500 miles, no issues. That was 4 days ago. Tonight, get into my car, start it and bang, CEL comes on. Same codes. Can someone please help me out here. Is it Spark Plugs? Coil Packs? MAF? The fuel from the gas station is out of the tank so it cant be that. I could see there being one code from a bad coil pack but 3? Is that possible? Any help is appreciated.