Johnson 130 wont idle in gear

[dizzyspots]

Went out to test rebuilt lower unit...success!!! No more "clunk"!!

Motor ran great at cruise speed...38 MPH at 5400
Problem it wont run below 2100 rpm without using the key primer to keep it running....idle smooth in neutral, but as soon as you put it in drive it dies

Fresh fuel
New filters
New fuel pump
New water separator
rebuilt carbs, cleaned jets
flushed all lines
new plugs
fresh "ink and sync"
Help..any ideas???