2021 suzuki 9.9 bottom end shake?

[Double Seagull]

So i picked up a 2021 suzuki 9.9 power trim/start. Got it all hooked up, fired up running great, pushing good water with the muffs, put it in forward...... the only way I can really describe it is a real rough clunking, like the whole bottom shaking..... up the RPM a tiny bit.... smooths right out.... back in neutral super smooth. Heck even went back to see if it was the prop guard that was loose..
Shutter down, threw it in gear check to see if prop was meshing with the gear... all good. Bottom oil was fine.... just at a loss of why it shakes and rattles no RPM and then smooth out as soon as you hit the throttle at all

 

[Max123]

I'd change plugs and check wires for a misfire. Do you have a tach where it could display a code?

 

[Max123]

PS - If you are in the greater Vancouver area talk to the guys at Maple Marine - they are the main Suzuki dealer out in the valley and were great to deal with when I had my DF40.

 

[Double Seagull]

I'd change plugs and check wires for a misfire. Do you have a tach where it could display a code?

No tach. It just had a service done by previous owner with records.

Part I can't understand is when you give it throttle it totally smooth out.

 

[noluck]

idle in gear is probably a touch low