irregular miss or fuel deprivation

[Murray1538 at aol.com]

I'm new to this list because I need help with a problem that I've been 
having.  I have a 87 5ks and it irregularly, doesn't matter if it's cold or 
hot outside, or car temperature it starts to hesitate and miss.  Sometimes at 
stop lights sometimes on the highway.  It seems to loose the power of 1 
cylinder or have a fuel deprivation problem.  So far I've changed the fuel 
filter, plugs, wires, cap and rotor.  I am somewhat familiar with the car, 
but I just can't figure it out.  Any help you could give me I'd really 
appreciate it.  

Thanks,

Michael