Hello all I was working on my 05 wrx with my brother. I had an oil leak in a valve cover gasket on the passengers side. We got to fixing it and we put everything back exactly how we found it but we ran into some issues afterwards. First of all I left the power on so we had the radio to listen to and it turns out my battery drained out in the process. During the work the intercooler started buzzing or at least the sound came from there. It literally sounded like a bee. I took out the key and the sound went away. We thought that was weird so we just went ahead and finished the job. After we were done I started it up and the check engine light came on. Codes brought up MAF sensor. Next day the light turned off. I floored it to see how the engine felt and the pickup was substantially lower than before. In fact at around 50mph at 4.5-5.5rpm my car hesitated in the acceleration. After this my engine light came back on blinking and hasnt gone away. I read that a blinking light means cylinder misfire so I got the codes re checked and now I got MAF, air temp sensor, cylinder 1 misfire. Any ideas??