I was running great first 5 hours but now loading up ,running rough coming out of the hole. Once you're out it runs fine and doesn't miss. But seems to be missing real bad or flooding (bogging down) coming out.. to on plane. It's the 2001 502 EFI . I'm on the second tank of fuel. Any idea's?

Still haven't put the labbed Bravo 28 prop on yet. Still trying to get used to the boat and handling before it goes any faster!!

The vapor lock seems to be what my hard starting was. We had 1 warm day and 2 cool that I was out. It started fine without running before shut down on the cool days. Started fine on the warm day when I ran for a minute or so at high idle before shut down. But the once I forgot to run before shut down on the warm day had to raise the hatch and let it sit for awhile . Seems like there's got to be a fix for this?

What type of carb???

Fuel Injected...

How new are your ignition parts? Make sure to check the basics first.

Lakebum;

It sounds like you are LEAN to me. I don't know EFI all that well, but if you were carbed having that problem that's what I would say. I had a carbed 502Mag in previous boat and thats what the problem was...when I would put in bigger jets it didn't bog...but then I had the dreaded black transom

LAKEBUM,

It sounds like you might have water getting into the cylinders.

Have you checked your oil ? Does it look like a milk shake?

Your head gaskets could have let go.