Throttle and rpm issue

[bnick]

2012 Merc 150 four stroke
Two intermittent issues are occurring after initial warm up.
Throttle has a tough time getting back into neutral from the forward position. Almost like it's binding. I am assuming that it may have to do with higher rpms occurring because it remains above 1000. Which leads to the other issue...Upon start up, the engine will sometimes increase in rpms up to 2000 while still in neutral. If I shut it down and restart, sometimes it will idle normal. I'm guessing they are both related but don't know what the cause is? I've looked at the shift cables in the motor and they look fine with no damage

[EuropeanAM]

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Need to verify that the throttle cable is consistently returning the throttle against the idle stop (properly adjusted, and if a HOTFOOT, that there is no excessive wear, loose spring, lack of lubrication, or cable binding or stretch).

If all above are as they should be, a Voltage Sweep Test of the TPS would be in order. Engine "learns" TPS position (as idle) each time you key up or start (so it is EXTREMELY critical it always return to idle).