might wanna get ur electronics checked. might be rusty/cheap parts. output will be severely compensated and tone will be very muddy.
oh i checked the pot value on my epi lp a few years back and it was something like 200k (!). usually for les pauls the value is set to around 500k to let more treble through (i think), for a relatively brighter tone. my epi lp sounded much less muddy after i swapped out its pots.
but the stock pickups should go eventually la. from my experience they are pretty much muddy crap... so do yourself a favour. save up, and drop some decent replacement pickups in there. in the meantime, tweak!