This week on Car Talk, why does Michelle have to rock her car violently to get it to start? Tom and Ray have a highly advanced technical explanation, involving Eddie and Edie Electron. Elsewhere, the Magliozzis try to bring holiday peace to two married couples. First, Veronica's husband wants to re-live his childhood by buying a vintage Land Rover that's likely to spend more time sitting in the front yard than moving along the road. Later, Reed's wife wants to use his beloved Ford Bronco to tow her horse trailer. Also, retired mechanic Steve wants to try to change his own timing belt, but is worried about incurring the Wrath of Mom; and Jim's nephew used a bottle to scrape ice off the windshield of Jim's Tercel. Is the solution a buffing, or a bricking? All this and