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Old 08-20-2020, 02:10 AM   #1
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Default could use some help

hello all
i just got a 2005 3500 great boat but having a real issue port side engine seems to surge wont hold idle and very rough start when i push it up over 2000 rpm she will hold but difficult to get there cause i have to race it in neutral so far i did
all filters and good fuel
plugs cap rotor
iac
tps
fuel pump
i will take any and all ideas thanks
bob m
oh 5.0 merc mpi
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Old 08-20-2020, 02:44 AM   #2
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Water in fuel....
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Old 08-20-2020, 03:07 AM   #3
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i thought that but fuel is fresh new filters and starboard runs like a top off same tank
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Old 08-20-2020, 11:12 AM   #4
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Did you use a OEM IAC, if not I would do as others have reported issues with this. Did you replace the IAC filter (muffler) these get clogged and can cause your issue?
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