Hunting throttle when cold 520H

[Junkyard_sal 11]

I have have a low hours WH 520H

 

when cold the idle hunts. 
 

my small engine guy doesn’t want to touch an Onan saying parts are not available.

 

i know the intake could be a problem but it doesn’t seem to change when I spray carb cleaner all over with the air filter off.

 

that said adding choke seems to smooth it out. 
 

is there a good carb rebuild kit or intake seal kit? When running right this thing is a beast but the hunting is super bothersome and can be problematic if it dies on a steep slope! 
 

 

[Ed Kennell 43,469]

If you all ready checked the intake for leaks, just clean the carb.     I had to clean mine 3 times to finally stop the searching.

[Junkyard_sal 11]

Checking the intake again tomorrow with more carb cleaner 

 

is there a good carb kit if I get in there and something is amiss