I have a 1982 mercury 80 hp outboard motor. Mine starts no problem but when going full throttle it will die sometimes or takes forever to get going but it never gets top speed. I’m missing a third of the speed. When motor is trimmed full down its extremely slow and sluggish and then I start trimming it up so it will pick up speed. I used to be able to get 33 to 35 mph out of it easy no problem. Full throttle it took off like a bat out of hell. Now it’s like an 80 year person trying to run. Also never had this before but when trimming the prop up the boat starts hopping now where it never did that before. Any suggestions would be great. She’s an old but been a beauty for me for 14 years. I love her and wanna keep her going. #helpme lol