My Four Winns has been sitting for 2 years, after being winterized, and I having a hard time getting it started. It has multiport fule injection. Distributor and plugs looks good. I added 5 gallons of new gas with a fuel injector cleaner. It started with a shot of starting fluid and ran very ruff for a while and then it ran normal. That was yesterday. Today it will start, no started fluid, and run for about 5 seconds then stall. Fuel filter looks good but I'm replacing that tomorrow. Any help would be appreciated.