i genuinely hate these products....fuel cleaners etc....they are largely garbage. the exceptions to the rule are alcohol based products for use in buring water contaminated fuel, especially in diesels. These can also be used in very high doses to squeeze by an emissions test, but generally make the car run rather crappily....run that tank out and filler up with the highest grade of fuel available...u should be running 91-93 octane anyway....and i bet the issue clears.