Turned the key and sounded like a balloon popping. I got under the hood immediately and saw a tiny trail of smoke coming out of the small hole located on top of the air cleaner. Checked the plugs, they're good.
Trying to start it up now, it won't run but chugs and coughs a little bit.
Any ideas anybody? I'd love to find out it's a relay or fuel pump etc. Doesn't everyone's fuel pump whine occasionally, or was it a hint when I heard mine a couple of weeks ago?