This week on The Best of Car Talk, the Click and Clack Forensics team tries to figure out why Sarah’s Volvo burst into flames on her way home from its 60,000-mile service. Elsewhere, the good news for Allison is that there are still sparks between her and her husband. The bad news is, we mean that literally. Can those sparks turn from shocking to amorous? Also, can Paul transform his Subaru into a convertible for Summer, and avoid a catastrophe? And, on Stump the Chumps, we find out if Bill cut the cable that was keeping his Tahoe from sinking to the bottom of a lake. All this and more, this week on the Best of Car Talk.