Crankwalk is when the crank moves back and forth across the bearings, eventually destroying them, the block, and the crank. The block and crank are machined within a certain tolerance to minimize the amount of play between the crank and bearings. One theory about the cause of crankwalk is the block and crank where not machined properly. Another is a lack of oil. The odds of having crankwalk on a stock motor are low but as the motor ages and/or mods are added, the odds increase. The only solution is to put a 1G (90-94) dsm motor into the 2G. The most preferred motor is the 90, 91, and pre May 92 motors, which are known as the 6 bolt motors. The 6 bolt refers to the number of bolts that hold the flywheel to the crank, but that's just a way of identifying them. The reason they are preferred is they have a much larger rod than the 7 bolt (92-99) motors.