I take it that you live somewhere in the North Eastern US, or the Maritime Provinces, since you are using Irving Gasoline?

I would highly recommend that you don't keep using it.

Switch to Shell, Exxon, Mobil, BP, whatever.
Irving gas is crap, and even though they sell it for cheaper than the competition, they water it down in some cases, and over oxygenate it in others.

Use something else, and your issues will most likely go away.

BC.