#1
my electric guitar doesn't hold tuning (2nd and 3rd strings to be exact), so i was told i need to change the tuning pegs (don't really know how are they called in eng). do i need to change all of the pegs or just those 2 that don't hold tuning? and whats the approx. price? is 100$ for all 6 a reasonable price?
#2
Firstly what guitar is it? Does it have a Floyd rose and locking nut?

Alot of times, its a badly cut nut that causes tuning issues, or bad stringing technique.
Agile AL3000
Douglas WRL90
SX SR1 STD Plus
J&D Strat
Squier Tele
Sammick TR2
Douglas Draco
Peavey JSX
Bugera V5
TWANGED VJ
#3
ibanez sz520, i don't think it's bad stringing, because it is like this for like 1 years and it's always the same 2 strings. and the nut looks alright to me
#4
What gauge string are you using in what tuning? cech that everything is tightened down on the tuning heads etc. This guitar doesnt have a floating trem so im guessing either the nut or machine heads/improper stringing at the headstock
AMP:
Rocktron chameleon 2000
Roland GP16
Audio Technica wireless
Peavey valveking
Clydesdale custom case
GUITAR:
Indie super T black (modded with active and passive pickups)
Daisy Rock Rock Candy Special