I have a 2012 Rt limited. When bike first cranks the rpms go to 1700-1900. Rpms will not advance when throttle is twisted. Will idle. After eng. warms up I can turnoff, crank bike again and every thing is fine.
How many miles are on the bike? Reason for the question: TPS, Throttle position switch could be bad. THe switch could have a bad/carbon spot on the resistor. You normally can not clean the switch it just needs to be replaced.
Sticlshift, The high speed idle, if for a few seconds would be fine and is common on my bikes. If the idle only drops when the engine is turned off then back on then the only place to look is the idle air valve. This valve along with the air temp control will set the idle speed.
I had a problem on one of the Spyders and after removing the air box found a dirt dubber nest affecting the throttle/idle,