I went to cartes lake on Wed to mainly tes run the motor after new plugs and wires. I still have a few issues, While on plane @ 5200 RPM it instantly dropped to 3000rpm for about 30 seconds and then it went right back up to 5200. It only did this once. Wrenchin2 gave me Sam Jenkis # and last night I called him and he was thinking power pack for that problem, told me to check the terminal strips and the grounds first. So that is on the list of things to do. Second when it would run at high end it would chatter, the guy I was with suggested the leaf valves may be going bad, it's an 88 motor so I guess it could be possiable. Sam also told me to install a water filter seperator and run 93 octane in it since its a GT model. Any advice on the leaf valves? Do they go bad? I did buy a manual for the motor so i can figure out how to inspect them but it would be a pretty involved job. And last but not least SPEED!!! I have a 19' VIP, the motor is a 150 gt johnson with a 19 pitch prop(seems low to me) and the fastest I could get it to go is 40 mph by gps. Seems slow for a 150, but i dont know, my old 90hp would run 47 with a 19 pitch prop and it was a deep V. I just got a 10" jack plate, but I'm trying to wait till winter to install it since I have to pull the power head and install a new upper mount. Any thoughts and suggestions would be helpful emoToast.