2004 Jeep Grand Cherokee Q&A

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

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 -
Answer 1
have it scan tested for codes it might be a plugged converter -
Comment 1
no codes come up -
Comment 2
check to see if your converter is plugged -
Comment 3
what is best way to check -