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After replacing the spark plugs, the car started to miss fire sporadically at a traffic light. The plugs are Bosch and were bought from AutohausAZ...The car was miss firing a lot less than after replacing the plugs.. The coils are not replaced..
 

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After replacing the spark plugs, the car started to miss fire sporadically at a traffic light. The plugs are Bosch and were bought from AutohausAZ...The car was miss firing a lot less than after replacing the plugs.. The coils are not replaced..
The coils should be replaced with the plugs. If it wasn't that bad before it sounds like you might've replaced them with the wrong plugs. You should double check that all the coils are connected nice and snug to the harness...
 

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Maybe the coils were already on the way out and disturbing parts made them run worse...
 

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How many miles?
What did the plugs that came out look like?
Did you check the gaps to make sure they were in spec?
Do you have diagnostics that tell you which cylinders are having
problems.
 
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