ok this has got me stumped when the engine is cold on my 1991 gsxf750 it will run at idle ok but when hot it has a intermitant fault
most of the time it will drop onto idle speed when I pull up at a junction
but about 3 times out of ten it will sit at 2500rpm when I pull up unless I try to stall the engine and then the revs will drop to tickover engine runs fine the rest of thje tme