200 Mercury rpm fluctuations

[Salmonkiller01]

New guy here and my first post , thanks for allowing me aboard

2020 Mercury 200 rpm is fluctuating 20-100 rpm at idle , 40-50 at cruise speed
Wonder if someone else has had the same issues, started about 2 months ago

full service
plugs, double checked gap all burning the same by color
new Racor and engine filter
no fuel restrictions, replaced all hoses fuel flows easily
fuel pressure at 45 psi

what I noticed yesterday was that my voltage is now moving .1-.3 volts also where it would hold at 14.2 normally now 14.2-14.5 fluctuating
Rpm used to hold steady at 600 at idle
engine is not a smooth as it used to be, vibration

any insight would be great as dealers are 2 weeks from looking at it

serial 2b692965