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Did you use the recommended manufacturers spark plugs for your car? are they gapped as per the manufacturer...did you break a plug wire inadvertently while removing the plugs or crack a spark plug insulator(the white porcelain part of the plug)? did you knock a vacumn line(hose) off the engine when working on the plugs?
All four are on the top of the engine.the first two are easy to get to
the second two are under the coils. There is a series of four plugs two
of which are screwed down. Unscrew these and you can easily remove the
first two plugs. The second two arenot as easy. The connecters arenot
screwed down, but under are the coils you have to remove them with a
special tool to get to the spark plugs underneath.
The spark plug gap is usually set on the plugs when you get them new. But its best to check them with a guage. The spark plug gap measurement should be located on the sticker under your hood beside the engine size/i.d. or inside your owners manual.