Hey guys. Just wanna get your input. I have a mechanical 3406c 3zj and last month it was idling and just started running rough. I finally had the time to check ####. I threw a clear hose on it by the fuel/ water separator and it had bubbles in it. So I just changed both fuel lines since I was there. Also new fuel and fuel water separator filters. Pumped up hand primer till hard. Started up fine. But still does the rough idle off and on. It’s a single tank with top mounted fittings. I was gonna try Transfer pump next but you think it could be the solid feed line going in the tank pulling fuel? It only runs rough to about 8-900 then she cleans up and pulls.