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2004 with 5.o litre Mercury - 3400rpm warning and rev limiter

gdniwa Member Posts: 1
Hi, has anyone any issues with a 5.0l warning beeping coming on at about 3400rpm and rev limiter kicks in so it wouldn't rev any higher.
Has a code for water inlet pressure and found on another group somewhere it may need and ecm reflash. 
Any help would be greatly appreciated. Thanks