I'm one of those people who is far happier with a 2CV or Renault 4, than I am with a Nippon Whiz-Bang XX GT Super Turbo Special (Sport Mk 2).
It took me many years, but eventually I mastered the cleaning of plugs, tinkering with the distributor, filling with petrol, and topping up the oil. As long as there was a spark in the battery, I could make almost any car engine start.
Then came all the complications. Electric windows, automatic door locking, digital clocks, no choke, etc. It wasn't long before a car's engine needed to be plugged into a computer at a specialist garage in order to find any fault, and with such complicated engines, there were faults-a-plenty. I was totally lost!
Recently my car (The Compact Royce) spluttered a couple of times, and I panicked. I ran hot-foot to Mr Google and described my problem to him as carefully as I could. An answer came back almost at once.
It was the air filter.... I didn't even know it had an air filter.
So, I took all the details, consulted Amazon, and with little confidence I ordered a replacement. It arrived just three days later, and amazingly it was the right model, I chucked the old dirty one, cleaned out the interior of its container, and the new one fitted perfectly (above).
Since then I have suffered no more spluttering; clean air must have done the job.
p.s. I remember a couple of years ago having a slight problem with my chainsaw. My friend José asked if I'd cleaned the air filter. My reply was (you've already guessed) "What air filter?"