Maybe this isn't something major, but I've always saved big bucks on automotive repairs by catching a microscropic problem before it became an elephantine problem.
Excepting the last two weeks, when I've been laid low, I drive the vehicle circa 800 miles a week.
About two or three times every week, there's a peculiar phenomenon.
The automobile is running fine, doing all that I tell it to do, when suddenly and abruptly and for a few seconds, there's some sort of "vrrrrmmmmm" from the motor, as if the vehicle wants to go faster than it's going.
At the very same time this happens, one "senses" something is losing traction, and trying to "grab," and not quite grabbing.
The automobile continues to operate as if no "vrrrrrrmmmm" has issued forth.
But a clearly-discernible "vrrrrrmmmm" has issued forth, and I'm wondering if it means anything.
I am concerned about this, and as soon as I'm healthier, I'm going to inquire of the mechanic, but before then, I'd like an idea, or some ideas, speculation, about what might cause the engine to act in this manner.
This can happen randomly, at any speed between 40 mph and 100 mph, and under all sorts of climatic conditions and regardless of the terrain (surface of the road).
In answer to the obvious question, yes, there is gasoline in the tank when this happens.