My 60 series 3B started sputtering randomly the other day while I was at the gas station. Didn’t insist for three days until now when I was driving on the highway and it started sputtering really intermittently every 2-3 minutes. feels like the fuel cuts out for a second as if there is an air bubble in there and then continues however, doesn’t stall. Seems fuel related. Could it be the filter or the sedimenter? I put a small amount of sea foam in the tank the other day, maybe 1/4 of a can. I have never replaced either of them.