Delete Empty Cells In Column

I am using the code below in an effort to copy two columns from Worksheet1 ("S:S","T:T") to Worksheet3 ("A:A","B:B"), delete the empty cells and then find the difference between the two values for each row("C:C"). I do not want to create a new column in Worksheet1. The code worked great before adding the SpecialCells code but was slow since it had to also process the blank cells. I am trying to speed it up. The code has an error on line five and I cannot seem to figure out why.

Sub TempDiffok()
Dim wsNew As Worksheet
Set wsNew = Worksheets.Add(After:=Sheets(Sheets.Count))
Sheets("Sheet1").Range("S:S").Copy Destination:=wsNew.Range("A:A")
Sheets("Sheet3").Range("A:A").Select.SpecialCells(xlCellTypeBlanks).Delete Shift:=xlUp
Sheets("Sheet1").Range("T:T").Copy Destination:=Sheets("Sheet3").Range("B:B")
Sheets("Sheet3").Range("B:B").Select.SpecialCells(xlCellTypeBlanks).Delete Shift:=xlUp
Sheets("Sheet3").Range("C2").Select
Application.CutCopyMode = False
ActiveCell.FormulaR1C1 = "=RC[-2]-RC[-1]"
Selection.Copy
Columns("C:C").Select.PasteSpecial Paste:=xlPasteAll, Operation:=xlNone, SkipBlanks:= _
True, Transpose:=False
End Sub

The last two lines are from the previous version before adding the ability to delete rows prior to the calculation.