I had a compact car, that ran virtually without maintenance, for over 100 thousand miles.

The only problem it ever had:
Sometimes, the engine would "cut out" when I went fast around a traffic circle (round-about). When the engine lost all power the car would slow to almost a stop. Then, it would re-gain power and exit the circle. This happened without regard for weather. There was never any other engine problems.

One day, I found there was a wire (harness) that had been moved, by a mechanic, early in the service schedule. An ignition wire was pulled by centrifugal force, to chafe on the engine. When the chaffing wore a bare spot through the insulation, the bare part would short out, each time the centrifugal force (round-about) would re-appear.

Two cents worth of electrical tape, and back to flying around the traffic circles!

Not that this is any help, I just like telling the story.

-Adam-