My car always runs better if I give it a car wash.
Growing up we had a 60 Plymouth station wagon. It might start. It might not. My father was best at getting it to start but often even he could not win. Sister drove it a while and often had to call for rescue. Temperatures below 30 degrees were particularly treacherous but no temperature was truly safe.
It also had the push button automatic. With no Park. I guess you were supposed to engage the parking break when parking on a slope. That didn’t really work either, no matter how many times my father adjusted it. And someone would inevitably drive off with it engaged anyway. He just kept a 6x6 block in the back for us kids to shove under the wheel if we had to park on a slope.
We also had a ‘60 VW Beetle. If you removed the radio fuse from the fusebox under the hood the engine would stop running. Reinsert it and it ran fine.