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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It is made up of an electrode (the tip where the spark burns), a metallic nut, a white ceramic insulator, and a connector the spark plug's wire is connected to. It is tightened around the cylinder head. The engine usually has one spark plug per cylinder.
When I have the Van in gear it won't run smooth and stalls just changed spark plugs and wires and put the manifold rods back on still having idle problem?