I have a 1993 Mazda Miata that "occasionally" afte being driven for awhile will not start. It cranks over, just won't start. Sometimes when I am at an idle, in gear with clutch in or in neutral, the idle also fluctuates from 1500rpm to about 1000rmp and acts like it is going to die? Any ideas? No check engine light for the OEM to read? Thanks, Arizona Cowgirl

Replace the Ignition Control Module (ICM), being sure to coat the back of it with silicone heat transfer compound. It's AutoZone Part Number JA196, $109.99. Super simple to replace.

Failure to apply silicone heat transfer compound will cause the ICM to quickly fail. Arctic Silver 5 is recommended by an AMHD member, which is available at Radio Shack.

If the ICM and the heat sink are simply placed together, the small air gaps (insulator) that naturally exist between them will inhibit heat transfer. By filling these gaps, the compound allows a direct path through which heat can travel. Failure to apply this grease is one reason why some vehicles suddenly die. Attention to detail makes a big difference with modern-day electronics.