Ok update.
for 5 min nothing happened.
Then I decided to pull back the rpm past 2000rpm. to 1970 rpm
Then the pressure dropped to 70 psi and temp 70f
Thats how it is now with full shutter.
FULL rich carb heat 3/4 with 90f. Speed 160. OAT 08C/50F indicated.
What concerns me is the engine temperate.
All engines indicate 90-100F. The manual said I should keep it between 200 and 350F if I recall correctly?!?