4-throttle is very sensitive parts. If you send to the mech that don't know anything abt 20V then its the starts of your nightmare man. Send to Ah Choy at Kepong or Ah Ngah at Bdr Tech Kajang for full service. Or you may call Sifu EFN for door step service but need prior appointment.
Now adays no more 100 buck for 4-throttle service lar.. would you like to charge 100 for a 3~5 hrs job? EFN's last offer price was one and only in this world. My mech at Puchong last time charge 280 to take out the whole 4-throttle for truly clean ler (with guarantee satisfaction)...
And remember not only clean the 4-throttle, that ISCV must be clean up as well or you will still have idling problem.
And if someone offer you liquid cleaning w/o taken off the 4-throttle then you have better run as fast as you could.
Good luck buddy!
puchong which workshop at where?