hi all , got another ? for all you experts. my 1984 35 hp rude, when i get it going , i can run it from idle to wot no problem back and forth for about 20-30 min. then she seems to start having troubles, if i go back to low speed or idle , and try to open it back up it is like it wont take its fuel, and stalls. after friggin with the fuel mixture switch and manually working the throttle while someone turns the key i can get her going again, and get it reved up half decent, and run to the gear lever and throw it in foward quick and take off, works fine while opened up, but then slack off the throttle again, and she dies and i have the same 5 or 10 minutes of friggin with it to get it going again. {phew} that was a mouthfull i know , sorry any ideas on what might cause this problem ? thanks in advance guys.