Low RPM Shuddering

When I am starting off or pretty much anytime I am below 3000 RPM if i get even slightly heavy on the gas, I will get a shudder like the car might want to stall out. Ac ouple things run through my head:

-Seems like its getting too much fuel, but I am not giving it much.

-I noticed a very small leak on the valve cover which will have to wait till this weekend to be replaced, but it does not seem that such a small oil leak will do it, i have lost about half a quart since last check a month ago.

If i get above 3000 RPM its pretty much disappears unless i put the gas on the floor board and then it sputters a bit and start back to its normal midrange pick, strong and hard

any ideas on what else to look for while i got the valve cover off this weekend??

replace that valve cover and check those spark plugs and wires......!