1976 Evinrude 135 HP starts up, runs like a champ and after 20 min to an hour of use it will start losing power randomly almost like the engine is being choked out and then out of no where it will take off like it was running great. Sometimes when it is acting up if I speed up too fast it will just bog down and die, during these times, if I just give it partial gas it will eventually work it's way out and start operating great again. It also doesn't like to idol during times of acting up but then will start running great again for seemingly no reason and last when the motor is acting up the engine warm up lever does not respond the same. Normally I just lift it a little, turn the key and in almost no time it is just roaring like a champ(especially when it's nice and warm) but when it decides to act up the motor seems like it doesn't want to rev up like it should during start up procedures. Pleas help
