Have 97 200 efi can only get 4200 rpms .Boat starts ,and idels great,but when I put the throttle down real sluggish and no guts, not enough power to push itself on the trailer. Have new ECU unit. Any ideas?
Are you talking 4200 rpms under load or just reving the engine in neutral? Did u check the basics plugs, fuel lines and primer ball? Also check your fuel line to see if its the old fuel line i believe the old fuel line is grey in color. If you have it you need to replace it regardless even if its not the root cause of your issue. The fuel line breaks apart from the ethanol. If all those things check out further investigation will be needed such as compression test, checking fuel pressure and so on. Good luck let us know what u figure out!
Have you replaced the fuel lines? If it has the original grey Mercury line Id bet it could be causing your issue..The ethanol is destroying the inner liner and restricts fuel flow.
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