To begin with I had a starter problem an had to rebuild the starter. when i reinstalled the starter it would only spin and not engaged the engine. when it sit overnight it would engaged after trying it 6th or 7th time. I was advised to add seafoam to my oil and drive my 85 Interstate 100 miles to clean the sludge out of my starter clutch. well when i drove about 50 miles the engine just shut off like it was out of gas. when trying to restart the starter would only spin so i trailered it home and the next morning it started just fine, but run only about 15 mins before it shut off again. i checked the dogbone fuse an even installed a inline blade fuse. i can let it set overnight and it will start right up but will shut off after 20 mins. any suggestions and thanks