You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources , and more. Learn More In afternoon trade, the S&P/ASX 200 Index (ASX: XJO) has followed Wall Street's lead and dropped deep into the red. At the time of writing, the benchmark index is down 1.6% to 7,731 points. Four ASX shares that are falling more than most today are listed below. Here's why they are tumbling: Amotiv Ltd (ASX: AOV) The Amotiv share…