Mitsubishi 3000GT Engine Revs Up

In The Low Rpm Condition My Machine Was Caughing And Then When The Rpm Is Already High, It;s Have No Problem

Im Hoping That Someone Can Tell Me What's Going On. As It Says. I Put The Car In Drive Won't Go Anywhere. I Put It In Reverse And It Still...

When Going Down The Highway About 55-60 Mph The Rpms Drop It Makes A Click Sound And The Check Engine Light Comes On.