Edelbrock mid throttle problem

It would also be a good idea to take a look at your spark plugs after cruising. Just to verify what sounds like a lean condition. Possibly too light a metering rod spring or too fat a metering rod, too small a jet or a rod with a step in the wrong spot for your application. I would clean the metering rod pistons with steel wool so they are nice and shiny, get all the dust off and dip them in ATF. Make sure the piston bores are clean and smooth. If you don't have a tune up kit for these there are things to do but you risk ruining parts or eliminating your base line to go back to. You can thin the metering rods with emery cloth, measure your springs and either stretch (rich quicker) or shorten (fix rich idle) them incrementally.