Yes Paul, that was the oxygen sensor I was referring to. I replaced it because the check engine light was on. After reseting the computer (disconnecting the battery) the light stayed out afterward for about a week and now it's back on.

I'll consider picking up that cheap duty cycle tester at Sears and run some tests with it when I have time off in early May.

So, back to my previous question. Is it normal then, to have a bit of fuel leaking outside the fuel dist and into the air flow meter?