cylinder misfire

Hi there! P0303 (misfire cylinder 3) just popped up after 121,000 miles on my 2007 CX-7 (i.e. turbo). Very unfortunate since it was running so nice lately. Anything different lately? Well, new gas tank 30 miles prior (doubt that is the problem), and 2 tanks ago I put a can of gumout in the gas...

Hey guys, I've got a 2003 Protege5, automatic with the nifty shift gate and "manual mode." Recently, I've been having problems where the engine fires up and after a while the whole car starts shaking. The engine vibrates A LOT. It's not noticable at higher speeds/RPMs, but definitely freaky...

So my check engine light came on on last Thursday so i went straight to autozone to see what code it was and it read Cylinder 2 misfire, and thermostat problem. So first thing I did was check my spark plugs, which the second one was a little lose in their and it was all black and charred up and...

Hey guys, I've posted about this before. I've had a cylinder misfire issue, but for a while it seemed to go away. Now its back. Its been getting worse. I've pulled all the plugs and coils and I'm confident its not an electrical issue. Haven't tested compression yet... but I wanted to run...