RB
I have a I/O and my throttle is the same way, What I found out was it wasn't the control, my shifting cable had been bent during some work on the outdrive and when it was in gear (fwd) it would be hard to move and wouldn't stay without holding it.
1 mechanic told me that after it goes in gear then the shifting cable doesn't move but that's not right (on mine anyway), I took the shifter box loose from the cables and the handle moved great but when I hooked up the shifter cable it got hard to move.
Yours might be 1 or both of the cables may need greasing or replacing.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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