weird issue with p60 outboard

[<help>]

OK, have P60 outboard,
Stalls above 1300 rpm unless choke at medium (get to port) setting.
Runs great at full throttle 5000+ rpm but when I hit a wave hard it drops to about 3000 rpm and stays there for some time. Suddenly regains power until hitting the next big wave pow! Spark good in all 4 cylinders while in "bad" mode. Disconnecting the "back to port" wire is no help. In bad mode, notice #2 plug coated with oil (not burning).
Any ideas?

[<boats.net>]

Probably need to start with carb job, rebuild carbs and choke primer

[<carb parts>]

please tell me how I would order the carb / choke parts required for a rebuild - there does not seem to be a carb kit.
Thanks.

[<boats.net>]

If it's a 1991 P60 use (1)6H3-W0093-02-00 Carb Kit
(1)6H3-24411-10-00, (2)6H3-24434-10-00
1992-99 P60 use (3)6H2-W0093-10-00 Carb Kits,
(1)6H3-24411-10-00, (2)6H3-24434-10-00