Was the Stepmother sabotaging Jr.'s motors?

If not for five blown engines, Dale Earnhardt Jr. would be racing for a Nextel Cup championship in this final season driving for his late father's company. Instead, three failures in the last seven races -- including one with six laps to go Saturday night at Richmond -- knocked NASCAR's most popular driver out of the Chase for the championship.``We broke another motor, and they seem to fall apart when they plug 'em into my car,'' Junior said. ``It's just really frustrating.'' It's also more than a little suspicious to his legion of fans, who have wondered for weeks if this was sabotage on the part of his stepmother.