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3.7l 4cyl runability issues after 1 hr of running

cape boater

New member
Good afternoon Forum
I have a 3.7L 4cyl merc cruiser with runability issues after an hour of running. I have had it at the shop twice in the last month and neither time has fixed the issue. It runs great then gets hot and then it either won't run or does and sputter alot. I don't want to bring it back to the shop again to pay for work that isn't fixing the problem. i've done a complete tune up to the motor cap rotor points condenser. so after doing all that first i'm still having the runability issues i had before the tune up. Any suggestions on what to check for now? Need help and have no idea what to fix now
 
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