I have a 1971 merc 1150 and it sounds kinda rough when i put it in gear. I kinda cring a little like it has to jerk into gear. Would this be because it is idled up to much? That is what i think. One more question why i am typing my boat will lose power at higher rpms and i noticed that my primer bulb had some dry rot cracks in it but not the whole way threw where anything comes out of the cracks. Could this be some of my power lose at wot let me know thanks. it is a walmart primer bulb!!!