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50FBYPBC losing power upon acceleration

Ok so this is a OMC/Volvo Penta engine and seems to be different then any other volvo penta as well as only finding info when searching for omc hence why im trying my post here.

My engine loses power upon acceleration. I habe rellaced both fuel pumps and have 30 psi on the high pressure line. I habe changed out the raw water pump because it began overheating after changing pumps. I changed plugs, wires, distributor cap, rotor and ignition coil the problem still exists any ideas would help. Yes all these items where tezted and needed to be replaced I wasnt throwing parts at it.
 
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