Prolonged idling is what usually can kill an ignition module.
Long ignition dwell times at idle, engine heat and hardly no engine bay air circulation warm up the module quickly.
I've had a 4-pin module fail which was mounted on the pass.side inner fender with a cooling block. It bailed after sitting in heavy highway traffic for a while. Just when we could speed up again, it failed some 5-10 seconds later.
Also had a ign. module in an '88 European GM-car years back. Same deal... Long 15-20 minute traffic jam, get moving again, engine dies never to run again. Another toasted module.
They need better cooling.
