[Skywalker]

Hello Guys
I have been flying with my P337 .N88TN for 3 months now and most of time IFR from Poland to Milan on business trips, today I was at FL170 and were in the clouds for about 30 ,mints and had some light trace of icing on the boots, during this phase of flight I noticed that front engine had lost some of its ;MP and it was showing only 27 inches,( it was set at 31 inches)
I pushed the throttle full forward but no change in ;MP' Then another thing which was strange that I could not pull the throttle back, it was like it was stuck in same position, after some time in skies clear of clouds this situation went off and ;MP came back , any clues what could be the cause. thanks a lot of for all the feed back
Dennis