Yamaha Hpdi 150 crazy accelerates

[Echapa13]

Hi I'm working on a Yamaha 150 Hpdi it was giving me hard time with the coils ( sometimes work sometimes don't) I replaced them with new ones and is working fine but from nowhere at 2000 rpm jumps to 4500. If I stay at 1500 it runs fine
And is happening on my 2 engines check and Lub the cables and they are working good
Thanks

[greasyshaft]

What codes have been thrown if any? When does it go from 1500rpm to 4500rpm? can you actually hear the engines rev higher?

The HPDI drops two cylinders at neutral based on the shift position switch and then a couple more when revs get higher(still in N).