What Crankwalk is, is for some reason, the crankshaft bearings in these engines get wore down to the point that your crankshaft is flopping up and down with the pistons, you wont notice it at first, and then some day, your CSS will go off ever 15-30 minutes on the road and it'll shut your car off till it cools down, then you start it back up and it runs fine.

But after awhile, it starts banging around, screwing up the block, crank, internals just gone. If caught in time, you just need to rebuild the engine, but if not, then you gotta get a new engine. This is why alot of people replace the 95-99 engines with a 89-mid92 engine