It is quite common that people warm up their car engines before they hit the accelerator and drive off, but is it a good idea to let the engine run off to warm itself?
It is a good practice and not so good at the same time, and it all depends on your engine. If your vehicle has a carburetted engine, it might be a good idea, but if it is a fuel injective car, this might not be a good idea.
If you own a fuel injective vehicle, it is best to let a car warm up for a few seconds and then drive off slowly, that way the engine warms up faster than it would otherwise. If yours has a carburetted engine, it is okay to let it warm up a bit longer.