Shares of Advance Auto Parts (AAP) tumbled 20.6% in the last two trading sessions after it delivered dismal second-quarter results on Aug 22, before the opening bell. The stock closed at $49.15 on Friday, just 3% above its 52-week low of $47.73. At this juncture, investors must be wondering if it’s the right time to buy the stock given the dip.Now, this auto retail parts company has been suffering from quite some time. It missed earnings estimates in each of the trailing four quarters, with the average nega ...