1979 Mercury v175 dies at half throttle - HELP!

79Merc175

Cadet
Joined
Aug 7, 2006
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27
I just inherited this OB which had sat for several years but has less than 75 hours on it. So far i have removed the 3 year old gas, rebuilt the carbs and fuel pump, replaced fuel lines and the spark plugs. On the water & under a load she will idle great and run good up until the mid-rpm range then will die most times. If i quickly move the throttle level forward, 90% of the time she won't die and will plane out and run like nobodies business at WOT- just seems to be something inhibiting that mid-range somewhere.

Any ideas or suggestions are greatly appreciated since I am still a little green on these things.
 
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