Spark plugs and fuel pressure are good, that’s where we started, there’s a screen after the fuel filter too, that’s been cleaned. I read a thread yesterday that sounded similar and there’s was an electrical issue, wondering if this could be the case?
I know this was several years ago but hopefully someone sees this.
I have the same motor in a 2005 Four Winns and a very similar issue.
Most times it’s starts great on the first try, once started, it runs great for as long as you want, but many times, once you turn it off, it has issues...
