1989 Mercury Black Max 150

by Al

This started last year. Engine starts fine and idles fine. Once I move the throttle, there is no engine response until I get about 2/3rds throttle, it spools up like a turbine engine, and takes off. Once it takes off, I have fine tune capability to increase or decrease speed. If I stop and go to zero, or idle, it's the same thing again to get her moving again. I can guess a few different things but I don't want to throw parts, money, and time at it and have it not be the issue. Have you heard of this before or have any thoughts on the issue? My greatest thanks for your time.

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