i traded my esp ax-50 for a blue acrylic les paul copy..... i really like the guitar, and the sustian is amazing, but the tuning on it really sucks.... the think will barely stay in tune for like a half hour.... would it be the tuners, or is it just cuz the wieght of the body on the neck messes it up?????
everything else is just details
It could be the tuners although it is unlikely. Its more likely to be the strings on it or how you stung it. New stings will make a hue difference and also use a pencil to apply graphit in the nut which will help.
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they excrete feces, playing a vital role in the digestion system?

Stretch them when you tune them, it helps stability. Tune the strings, give them a good tug, and then retune them, it should help.

The above was what I was thinking when I read the OP question. How long have these strings been on the guitar? If they are new, they need a good streaching. I have noticed that it takes a couple of days for strings to stabilize.