Engine air filter
Keeps dust out of the engine. A five-minute swap you can do in the driveway.
Signs it's worn: Dirty grey filter, sluggish acceleration.
What's wrong with my car? · Engine
Car feels sluggish and slow to accelerate?
Usually: Clogged air filter, or plugs.
A car that feels sluggish can simply be breathing through a dirty air filter. It's a five-minute job. Old plugs cause it too.
The parts that fix it
Spark plugs
Fire the fuel in each cylinder. Cheap, and changed every 30-100k miles depending on the plug.
Signs it's worn: Rough idle, misfires, poor mileage, hard starts.
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This is a first read from the symptom, not a diagnosis of your car. If you're not sure, have a mechanic confirm before you buy, and bring the prices you found here with you.