somtimes car sputter and backfires: u can give it gas and it wont rev up on 2004 Jeep Grand Cherokee

we had it looked at on thursday they changed fuel filter and gas treatment said it was water in gas. ran good till today when it did it again

Asked by for the 2004 Jeep Grand Cherokee
have it scan tested for codes it might be a plugged converter
no codes come up
check to see if your converter is plugged
what is best way to check