88 merc 135 not getting full throttle

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I bought a boat for the motor,did a compression test and got 120 on all 6,rebuilt all 3 carbs and fuel pump. took it out for test drive,had amiss fire,pulled all the plugs and found the bottom right wasmissfiring so I replaced coil and wire tested with light all 6 fire, took it to the lake ran good for a moment started missing bad then died. bought dva adaptor tested and both switch boxes were bad,replaced,took it for test drive. It had a miss. went back to testing andfound key switch bad.so i replaced it and also rectifier.took it to the lake runs good on bottom end but onlt getting 3800 rpms, my question is do i dis connect black box .

 

[capt skip]

Re: 88 merc 135 not getting full throttle

I bought a boat for the motor,did a compression test and got 120 on all 6,rebuilt all 3 carbs and fuel pump. took it out for test drive,had amiss fire,pulled all the plugs and found the bottom right wasmissfiring so I replaced coil and wire tested with light all 6 fire, took it to the lake ran good for a moment started missing bad then died. bought dva adaptor tested and both switch boxes were bad,replaced,took it for test drive. It had a miss. went back to testing andfound key switch bad.so i replaced it and also rectifier.took it to the lake runs good on bottom end but onlt getting 3800 rpms, my question is do i dis connect black box .

Sorry guys I had to go before I could finish my question,My manual says the black box is a low speed idle stabilizer,or a low &high speed stabilizer it has 3 wires. I thought I have read about disconnecting it and adjusting the timing here in the forum but i am not shure if i can do that to my engine. Please help point me in the right direction,