Spark plugs problems

Spark plugs: Piece that produces the spark inside of the engine. It turns on the mixture of air and fuel that enters into the cylinders.
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2000 Toyota 4Runner 2.4 l 4 cylinder 178000 miles
Misfire cylinder 1 P0304 and P0300 with rough idle. Replaced Spark Plug, ignition coil and Fuel injectors and still have the same error code. Additionally, I Clean IACV. Is this a mechanical or electrical issue?
Tols from United States 5 months ago  
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