So earlier this week I got a code for cylinder 8 misfire changed the plug and the coil problem went away. Car ran good for a day or so and just last night I stared the beast and notices rough idle followed by the "death ding" CEL. plugged in OBD2 and got misfire code on all 10 cylinders. I did noticed really bad smell coming from the tail pipe. To back track a little now. Let my friend use my car and apparently he pumped 87 instead of 93. the next day I did syphon most of the fuel with a hand held pump from home depot cheap solution and pumped with new fresh 93. I was thinking maybe air in my fuel lines that is causing this misfire? Also can it be dirty MAF sensors?