#1
when i dont play anything rare sound form the amp came, but if i touch the guitar with my hand the sound goes, i dont know if is problem from the jack or from the cable
#2
Could be a possible bad ground in your guitar wiring.

Without more info though I cannot be sure.
1979 Gibson Les Paul Silverburst
James Tyler Variax JTV89
Schecter C1 Classic
Ibanez RG520QS
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#3
Definitely sounds like a grounding problem. Have it checked out.
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#5
Either the single coils, or the grounding.

This happened with me and it was grounding.
RIP Terje (Valfar) Bakken
#6
you are probably playing with gain. you have to mute the strings or you get feedback
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Quote by Doctor Matthews
Yeah I dreamt I was fighting Master Hand, but then I woke up to realize I was jackin' it in my sleep.
#8
That took me a long time to decipher :P

Earlier posts are most likely correct, grounding problem, or you have gain to high etc