Fertilizer doesn't kill weeds, it feeds them. I suggest popping them by hand w/a Weed Hound, or selectively spot spraying them w/Weed B Gone (or something similar). It's too early for a second application of pre-emergent for crabgrass.

someone told me that epsensalt helps clear up the brown spots in my lawn, have you heard of this.

CCZ75--You should probably start a new thread to ask a new question.

Weed and Feed fertilizer's do help kill some weeds. You could put out an application of this and then manually pull up the rest. Crabgrass takes time to get rid of. Be patient.

Here is a link that might be useful: Lawn Fertilizer