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1993 Merc issues getting up on plane

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Threewolves:
I have a 1993 Merc 175 HP on a 1993 20ft trophy and I am having a problem with it getting up on plane. When I put it in gear and push the throttle forward it will only get up to 3,000 rpm and not get up on plane. When I take it out of gear and push the throttle it will go up to 4,500/ 5000 rpm without any issue. 

Wondering if anyone has had a similar problem and and answer to this issue.

I tried adjusting the trim, it didn't help.

addicted1:
It won’t climb in RPM due to the load it is under when you are plowing you way through the water. What does you prop look like? Is the boat new to you or did it just start happening this year?

Have you done a tuneup this year, messed with the timing? I’ve had boats run fine under no load and put under load (in the water and in gear) they struggle. Had a carb that needed a rebuild as the jets weren’t working well. Have experienced a similar issue when the timing was off, but your timing should not be off unless something was messed with. Is it possible the boat was overloaded with gear and people?

teanawayslayer:
I’m not a boat guy but I wouldn’t think adjusting the trim isn’t going to help if your motor only goes to low rpm.

MADMAX:
I suspect its a fuel issue, probably 20 years of gas at the pump with ethanol

Caseknife:
Check the plugs, fuel filter, prop, fuel quality, any and all could be causing the issue.

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