2003 Mercury EFI 250 HP

by Russ
(Long Island )

Hi recently purchased boat went out eran fine Next time out drove 20 min than idled for 20 went to take off no power trimmd motor up to check if any thing was on prop .put back down took off fine ran at 3/4 throttle for 15 min idled for 15 same problem nothing worked to fix it had to Idle in Any ideas of what is wrong?

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