power dies at mid-range... please help!

i use to run 7/8 psi on my duster im not to up to speed on the eld. carbs...but you could try and turn it up just a little at a time a see. what reg. and pump you running also does the gauge have the fluid init??? if so you may want to drill a samll hole in the back a drain that out it can cause problems sometime not saying thats it but it can....also may want to do a fill check if your running a elec. pump.. by fill test you take the line loose from carb and time how long it takes to fill 1 gal. and check the specs on your fuel pump to see if they are inline...i test mine without the reg. and then with the reg....hope that helps maybe some of the others will have more ideas but that what i ran in to with my car..mike