This morning I went to start my S70 and it started but ran very odd...rough would be the best description. I turned it off, waited a few and turned it back on, then it ran fine. The only thing I noticed was the smell of gas shortly after.

I can tell you in the past months it's gotten all new coils (cause 2 went bad in a row, they were original) and plugs. Could this be a leaky injector or something of the sort? I'd like to get an idea of place(s) I should check.